Marvel Mystery Oil information, should you use it? Claims to fame. - VOTD 

When I was approximately 12 yrs old, My Dad was given a 1946 Hudson Pickup Truck which has a small 6 cyl. engine in it that was seized up from not being used for so long. So we towed it home and My Dad took out the spark plugs and poured MMO into each cylinder and let it set for 2 weeks. After two weeks we tried to turn it and sure enough...... it did. Amazing stuff.

I've used Marvel Mystery Oil for 50 years, in both my oil and gasoline. Over the course of all these years, I have never had a major engine repair. I believe in MMO! Thanks for posting the video!

Out of all the videos like this, this one gets my only thumbs up because you actually know what you are talking about.

I've use the product since I was 17 as a mechanic I'm 57 and I believe in the product it's worked for me for years MarvelOil the best

Listen to this guy because he really knows what hes talking about. There are very few people like him on the internet left these days. Not too many people have the experience this guy has trust me he really knows what hes talking about. Its all about the personal experience and whos been around the longest and who really knows and this guy does know and his advice is perfect.

Sir I Drive a semi Truck that hauls Liquid Asphalt. I noticed my Truck Sluggish on Hills that it normally takes with no problem. So I put in the MMO in my fuel. Almost immediately I noticed my Truck come back to life the same day (540 miles). Then I thought of putting a piece of hardened asphalt in 1 once of MMO. Since Asphalt is Oil. Immediately it started to melt the Asphalt back to liquid form. I the test bottle in the side box and moved on. The next day I checked it. The MMO had dissolved the piece of Asphalt back to liquid. I am sold on this product! Gonna put it in my engine oil next on all my vehicles! Keep up the good work. I’ll keep on Trucking with this Product.

Thank you sir. Also, great point about proper maintenance. I recently junked a 1992 Taurs. She had 380,000!! I was trying for 400k. Head gasket blew, didn't have money for repair, or any place here in NYC to DIY repair. Car was given to me as gift with only 74,000 miles. We had a long run together.

You make very good videos, and you don't curse like the non-professionals. Thank you, Robert👍

Its great stuff. Ive been using it for a long time in my 94 silverado. I quart of MMO every oil change. And ive got 330,000 miles on the 350 engine and it still runs great. Good job sir.

I've been using Marvel Mystery Oil in my GM cars and trucks for 38 years...... Low cost engine insurance. When use regularly keeps your engine running smoothly with less wear on the motor. Just add one quart and fill the rest with oil. Works with both regular and synthetic oils. Add 6 ounces to a full tank and as the gas pump gets lubrication your also lubricating the top cylinder of the engine.

Good video!!! Good to see people that doesn't need to use bad words to get their message across.

Great video! I am a firm believer in this product. I have seen it first hand. I have an old tractor from the 1960's that I inherited from my grandfather. He was old school and used marvel mystery oil regularly. This was a heavily used engine. So I disassembled the engine and I was surprised that it COMPLETELY clean. I checked the cylinder and crank shaft and they had very little wear. They were still within manufacturer specs. Marvel Mystery oil is the only thing that can explain this. I have continued to use it in all my equipment.

Yes. this oil made the lifter noise disappear in my minivan. highly recommend

Thank you, Mr. Robert. I(and i am sure many other's)truly appreciate how patient & thoroughly well-spoken you're in this educational video. Again, THANK YOU!

mystery oil works . Use it .

I use mmo in my fuel at every fill up in my 91 suburban. works well and affordable as a every tank additive. very nice video well laid out :)

Someone told me this will help clean your cat. I tried it, and it worked so good, i cleaned my dog too

I'm about the same age as you and sounds like our automotive skill set are very comparable. I appreciate your respectfulness and your tasteful humor as you replied to people posting comments. That says a lot about you as a person. I feel the same way as you about everything you said in the video. New oils are incredible compared to the older oils. I have recently purchased a 1987 Chevy Truck with 83,000 miles that had been setting for maybe 6 years. I bought it from my cousin and know the history of it. A fuel problem is why he parked the truck otherwise it ran fine. I can see some sludge under the oil cap. The oil was really thick when I drained it cold (have not started truck yet... but everything in the fuel system will be brand new after I rebuild the TBI this weekend so will be starting it up soon). I can turn the engine over easily by hand using a socket and ratchet. I have never really used many additives but after looking at a lot of videos like yours about MMO and many other products... I will use MMO in this truck at least for a while. My game plan is... pouring 20% MMO in with conventional oil and a cheap oil filter then running it until the thermostat opens and will drain the oil immediately. Will do this same process again after running 100 miles. Will take a good look a the oil during that oil change and decide what I want to do next. I will eventually run a quality synthetic oil and filter like I do in all my other vehicles. If I can remember to find my way back to this comment I will post the results on how things went. Thanks again for the video. It was nice to watch and read over the many comments.

Have used it for 40 years, it works fantastic on older design engines that were made for leaded gas. It will definitely remove carbon build up and lead deposits.

Robert, the viscosity issue is discussed on the MMO website. I believe it depends on the ratio of MMO:Oil. Here is the statement on the MMO website off their FAQ section: "MMO is about a 5 wt oil. It will reduce the high end number of a multi-vis oil by 4 wt points. The low end number will stay the same when used as per directions."

Yes sir you are correct. I have used marvel. Since the 70s .

MMO BETTER FIX THE CAP ON THEIR BOTTLE. NEARLY IMPOSSIBLE TO REMOVE.

I didn't have to take my engine apart to see if there was sludge. I changed the oil and filter and added the proper amount of oil (4.2 quarts), I ran it for about 5 minutes checked the dipstick and it was way overfilled and pretty filthy. Tomorrow, I'm gonna buy me a quart of this. Very informative video.

Robert I worked in auto service from ‘74 to 2007 and you are dead on the money and a true expert from experience, thanks for a great video.

Excellent video, Robert. I used this in the past and it does work great. But I agree that it should be used only when needed. You hit the nail right in the head. Again, thanks for the video!

One of the main ingredients in this product is Castor oil with is highly detergent and has good lubrication qualities..back in the early days of aviation castor oil was the only lubricant used in Radial engines because of its ability to shed heat and resist high temperature break down..MMO is good stuff

I added some of my this stuff to the gas in my 1963 Cub Cadet once and it made the exhaust smell like some kind of sweet candy.

Excellent presentation. Thank you. I have used MMO exclusively in gasoline for the life of several vehicles (since brand new until very old). What I have noticed is that it helps prevent wear of cylinder rings. Cylinder compression would stay strong as in a new car for much much longer. A car with 75k miles would feel peppy as if it had only 40 or 50k miles. A car with 180k miles would feel strong as if it had only 100k miles on the engine. I recommend using it ONLY in gasoline in small amounts - 4-6 ounces per 10 galons of fuel. It is OK to add a a liitle bit more than what instructions say.

Every other oil change to help keep my engine clean. My car has 233,000 k on it. 2000 Nissan Altima and runs smooth. No problems with my vehicle. I change my oil @ 3000 miles and maintenance is priority.

That's why I HAVE TO KEEP COMING BACK TO ROBERT'S CHANNEL. Because when he is explaining something to you. He doesn't get all technical so that you don't understand. Thanks for your knowledge Wisdom and understanding keep up the good work. 🇬🇧🏁👍

I use it in my 96 Polaris SL780 with 305 hours and my 04 Maxima with 226K miles. The jet ski would always start hard and wouldn't idle unless you held the gas a little bit. This mmo has made it run so much smoother with better response and it will actually stay idling. It also makes the VQ35 in my Maxima much smoother, from idling to redline and everything in between. I get about 2-3mpg better when I use it in my gas as well.

I have been using this for years. I tell you how I measure just the right amount while I am at the gas pump. I use one of those old “stabil” bottles. You know the stuff you use to keep your gas from going bad in the lawnmower. It has a nice measuring feature where u squeeze out the right amount of liquid. But I keep it in the trunk and use it whenever.

Short answer. YES, this oil additive is very good and can help clean and solve minor problems with your engine such as lifter tick.

Thanks Robert. I absolutely believe in and love this product. They used to have a container that would automtically inject this product into your engine. Keeps the engine running like new.

On the Marvel Mystery Oil website. It states that the viscosity is a straight 5W grade oil. Mixed with a multi-grade oil drops the operating temperature number down by 4W levels. For example 20% Marvel Mystery Oil mixed with 80% of 5W-30 would equal 5W-26. Obviously using the correct viscosity oil is critical to longevity. Great video Robert.

Nice work on this video. Great information to have. I have a 97 Wrangler Tj 2.5 with a tapping sound when she starts up. Takes a little bit for it to go away so I figure it needs a little love. This may be just the stuff. Thanks man!

Thanks Robert ! Great video and you obviously know alot through years of hands on experience ! Wish I knew where your shop is so I could take it to someone other than the dealer. I especially like your honesty about whether you use the product or not and analize it's worth through a scientific aspect. You're a very interesting person and I "liked" you and subscr ibed - keep up the good work !

I agree with you...I only use it as a fuel additive. And I have used it before and did not drive the car very far and I drained the oil and remove the oil pan...amazingly it does clean and have dissolved the oil sludge

Very informative video. I learned a lot.I like how you confirmed for me the ATF trick, I thought I was the only person who did that. AFT is half the price of these auto additives which is good for me.I love using Marvels/Sea Foam every once in a while. I Did an engine flush yesterday with Marves and seafoam Double-Down for 15 mins on high idle. Now my new oil change from the looks of it is the cleanest its ever been on my 132,000 mile car.I know people say this and that about snake oil, but I actually feel a difference in engine smoothness and performance when I do flushes and additives every once in a while.

To be honest I thought this was gonna be another "Oh this is the best thing ever - oils are lacking without it" sort of video. I was pleasantly surprised. Good stuff!

Couldn't agree with you more! With every thing you said you simply nailed it 👍

Thanks for your presentation. Want to share this with u. Sat along side my grandfather when he was retired rebuilding small engines. This was in the 70's. In those days it was called power oil, I think it was spelled differently. Grandpa put it on everything as he rebuilt these small engines. Most of the rebuilds were cement mixers, used in the Tucson, az heat. Have used this products all my life. I am 57 and come from big family, over the yrs my family has asked why my vehicles have lasted so much longer. Good conversation. This is a special product that has with stood the test of time. Take care.

makes plenty of sense....recently purchased two used cars for family members and used this product to clean motor before switching to quality oils and filters...unknown maintenance history of them was the prime reason....did not feel it would hurt if responsibly used and could only help....after several oil change intervals with product engines were definitely smoother and quieter. guess I'm a believer in this case.

Subscribed for accurate information. Too many of the smaller DIY channels just do a test and say "works" or "doesn't work" without doing much background research about why you would want or need to use this. You are different, sir.

I use this stuff in my truck, I was talking with my supervisor at work about what was going on with my truck, I told him when I would put regular gas in my truck it would get a real bad spark knock. Well, I told him I hated having to run mid grade gas in my truck because that was the only thing that would make my truck run right. He told me to try some Marvel Mystery oil, I put it in with a tank of mid grade the did it again with regular gas and it stoped like he said it would.

This man has old school knowledge and knows what he's talking about. Good info. About the ATF thing at 8:36.... I remember long ago people use to "clean the valves" by dribbling ATF down the carb holding the engine at high idle. I suppose ATF would loosen carbon build up but I don't know exactly how well. I just know it's a sure way to hydro-lock a motor if not careful.

it works ive used it in all my cars and lawn mowers i had a mower that popped and back fired i ran this in the fuel and all that quit

I have a 2005 mercedes e320 with 200k miles the problem was sticking lifter and stuck valve from a diagnosis mechanic they recommended engine replacement so I added 2 quarts of mmo and a week later the engine runs like new I can't believe it 😳 😀 thanks for the video 👍

It was designed to clean and keep clean carb jets. The usage in oil is a by product. It still does a good job, detergents in oil break down, I have seen some dirty modern motors, especially ones with extended service intervals. I would use it as a flush, by adding to oil and letting the car run for 15mins.

Great video and explanation. I've used this product for many years. I put a few ounces in the crankcase a couple of days before my routine oil changes. I really do believe this stuff works great as a cleaner/detergent. Have a great day sir!

History lesson, Marvel Mystery Oil started out as a motor oil for World War 1 radial aircraft engines. In 1923 they started bottling it and calling it Marvel Mystery Oil and adding a red dye. If you use it and today's engines, all one needs to do is about a week before they're going to change the engine oil, when the engine is usually down a half to a full quart, top it off with Marvel Mystery Oil run it for a week and then change oil. It is especially effective at keeping the sieves on the multiple displacement Engine Systems from clogging up as well as making sure that any chain tensioners you may have in the engine continue to work properly. Another use is to add a court during the winter months in cold climates and it keeps the engine oil thinner at the low temperatures so that the engine starts easier, and yet at 200° the oil viscosity is not compromised. It is more than up to the task of helping to maintain be most advanced internal combustion engines that we use in Automobiles, motorcycles and aircraft to this day. Almost all additives in oils today were around by 1980. It isn't the additives that keep the engine cleaner, it's the detergent. An old-school trick was to put a quart of transmission fluid into your oil for a few weeks before you got an oil change. Because that would help condition the seals, especially the valve guide seals. I've seen engines from the 1960s run 600000 miles. It wasn't the engine that was the problem by the 1960s. It was the suspension system and the fact that the suspension systems were being overtaxed by the larger and more powerful engines that work coming online. Remember that the first GTO had a 400 cubic inch engine putting out about 360 horse and only had 9 in drum brakes that were only 2 in or so wide. Modern engines are not particularly unique, especially with some of the new Engineers that have come on board who never turned a wrench they still sometimes overcomplicate things. When an engine gets overly complicated it is even more incompetent to make sure it stays clean inside. The multiple displacement system has an excellent example. There is no reason to shut off four cylinders to make the engine get better fuel mileage. All you need to do is when the engine is not requiring a load is to cut back on the air fuel mixture. Lean it out to about 11 and 1/2 to 1 and believe me it will get much better fuel mileage than just cutting off four of eight cylinders. You just can't convince Engineers who have absolutely zero experience of this fact. A further added benefit of Marvel Mystery Oil is adding it to your gasoline at the rate of about 4 ounces per 10 gallons. About 2006 or so they started taking the sulfur out of gasoline. Sulphur was what provided the lubricant for the fuel system and the injectors. In order to replace this lubricant the Marvel Mystery Oil actually works quite well bad actually keeps the injectors cleaner than the sulfur did. I forget how many General Motors products within a few years of taking the sulfur out of the gasoline no longer had a functional gas gauge because the sending unit was worn out from lack of lubrication, not to mention what it did to the fuel pump that by then is in the fuel tank. Do not discount Marvel Mystery Oil oh, I know it has a funky name, but it works better than any other single product that I know. As for Lucas, it thickens your oil far above what the engine is designed for, and it is also been linked to hardening of the seals in the engine and causing leaks. Use it for lubricating your hinges on your doors but keep it out of the engine.

Great video. I remember even in the early/ late 90s that 100K was high mileage category and 200K the engine ran badly on its last leg. Now my 209K on clock G35 is still running like new, doesn't eat oil.

robert, i just would like to inform you that all gas stations have a minimum recommended amount of additive in all gasolines. but any branded gas generally has more additive, hence the reason you pay more. you can buy cheap gas and add your own additive, but me personally i like to get costco gas, because they use their own additive which makes the unbranded gas they sell, branded, and top tier. all other branded gas stations have their additive that is added at the rack during loading. if you ask me how i know this....i haul gas for a living. great video.

It's good stuff! I've used it for close to 40 years. Had several vehicles with noisey valves. Poured some straight into carb, keeping the engine revved. Then the rest in the gas tank. Worked great!

I haven't used it in my 97 gmc sierra yet but plan on it. my boss never tuned it up lol having a misfire code. will keep u posted on the after math. I used it to rebuild a motorcycle motor the guy left the spark plug out moisture got in it and piston seized to the cylinder head so rusted I couldn't spin it so i poured it in the cylinder head let it sit for 4 days and it finally freed it up I was very impressed.

See like I have a 1987 Jeep Cherokee Laredo I just inherited and it had 236k miles with a five speed and runs pretty nice, I just want to make sure it’s clean, gonna do an oil change when I add this to oil but it’s going in gas tank right away

When you add it to gas it lubricates your upper cylinder walls.

Thanks for all the detailed information! I love listening to detailed informative videos! Glad you touched on so many different impotent pieces of information regarding oil!

Great video and info. Very professional. Thanks. God Bless you.

Intelligent and logical reasoning. I think what you said makes total sense. Thank you.

MMO works great,i use it in gas tanks and other uses like penetrating and air tool oil. I can keep one product in my garage instead of multiple different products to save room in my toolbox i typically use Rislone if i have room in the crankcase to free up lifters since Marvel has a higher flammability rate and it thins out the oil a little Which may or may not be desirable.

Im not going to stop using it it works for me i use it in vehicles in my shop it works great for neglected engines in some cases but it doesnt work for a neglected engine that has already been damaged from neglect or abuse no it wont fix worn out parts but it will clean sludge and fuel systems and boost octane performance with regular use

Preety good review. Why Do I use it. Its like the cheapest product out there that works. A gallon of MMO is around 15 dollars at walmart. I drive a 97 subaru use Mobile 1 Full synthetic. Now I do not as MMO when I do an oil change because Mobile 1 Full synthetic is formulated with special detergents and do not want to mess with that. Now about a week before I do an oil change Ill add a pint of MMO and drive it roughtly 200 miles. I call this my MMO engine flush. Now sometimes I do forget to add this to my gas and I do see my mpg go down abit. But on any given week and driving habit Ill see anywhere from 26-28mpg with MMO. If I dont add MMO ill get below 25mpg. I use it because it works.

I am a Bitoger and we unerstand that Varnished engines are better helped with the use of synthetic engine oils of the ester type (partial PAO partial Ester) in its base oils. Esters are more polar and solvent, so it attaches to the varnished parts and lift the insolubles out, just like a detergent additive would for detaching, with the advantage of dissolvation and dispersancy, with long term action to remove the deposits slowly to cause not clogging. As a result, at the end of the oil change interval, the oil start to get a hint of the color of the varnish. If the varnish is red, the oil will get a reddish tint, from the dissolving varnish.

Great Video! Very informative. Thank you for sharing your knowledge.

This is the kind of Mechanic you want working on your stuff. He does NOT have his head up his own ass and he cares about REAL RESULTS. He also knows the importance of doing proper analysis before drawing final conclusions and that's the kind of Troubleshooting Mechanic we all need. Too bad the Commercial Automotive Repair Industry fails to hire and maintain real Mechanics like this man. These days, commercial (retail) mechanics are mostly out there devising ways to SCAM the customer by *creating problems that did not exist in your vehicle before you brought it to them in good faith*. The world needs more Quality Mechanics like this one.

i add it to the crank cuz I use cheap oil. 3qt dino 1qt synthetic. I always put some MMO in the gas cuz I dont go to a station that uses premium fuel. THere is a website that lists what stations use premium cert fuel which has more detergents. MMO has unstuck a lifter for me.

From looking at the inside of your engine, it needs some serious cleaning. I switched my 2003 Honda Civic to Royal Purple oil and ATF fluid after 158k miles. The Frantz filter removes the oil's purple color in 15 minutes, turning to gold color. The first oil became dark quickly, so after 4000 miles I changed the Frantz Bypass Filter (Scott 1000 sheet single ply TP) and continued to run the same oil. However the oil was clean but remained dark colored from cleaning out the residue built up over the years. After 10,000 miles I sent a sample of the RP oil to be analyzed. It came back good to keep using for another 8000 miles with a TBN of 5.1. Even though it looked dark, contaminants were only 11 ppm vs 7 ppm for new virgin oil. I ran MMO for 1000 miles before changing the oil and both filters. The engine is like new inside with only a slight bronze tint to the surfaces. it was well maintained for the first 158k using regular oil changed every 3000 miles. The highway mpg increased from 32mpg to 42mpg. My son switched to Royal Purple oil and ATF in his Honda after using Amsoil for years. He also had a 10mpg increase. Same for my 2004 1700cc motorcycle that has nearly 40,000 miles. The first 35,000 were on Amsoil MC oil. The inside is bright and clean after the first use of Royal Purple and running MMO for 200 miles before changing oil. Royal Purple is incredible oil, even compared to Amsoil which I won't be buying again. Marvel Mystery Oil is also incredible stuff which I now buy by the gallon.

Alot of alaskan bush pilots use it. They get it by the 5 gallon container.

I use this in my fuel and oil in my porsche, HAPPY ENGINE! I also use it in my 8th scale nitro rc car! Great for lawnmowers too...it's good stuff!

Robert, We use to pour a small cup of MMO right down the carburators a bit at a time. Smokes like hell but man once the smoke cleared did that car run great.

Thanks for the info. I learned alot. I'm glad I found someone who knows what they're talking about

Great video. It was cool to hear a bit about MMO's history. If I were to buy a used car with maybe 30,000 miles on it, would you recommend using this to clean it out just in case?

I've used MMO in my Gas in older Volvos and certainly made the engine seem to run smoother.

MMO: Swear by it or swear at it; added to fuel, it lubes the fuel pump and the injectors.

I agree with much of what you say and made those same assumptions, I use castor oil and think this is quality oil. I through my years have always put many miles on my vehicles , now I have a 97 blazer, pull a trailer much and this was a well maintained county truck. at 225,000 miles I changed the oil pan and found much build-up. I use MMO periodically , I now have 300,000 miles. honestly I don't know how well this additive works, I have used it for about 40 years. I love my vehicles, this proves it!

I like the Steelers hat.

Have used the stuff in fuel as directed and sometimes added to oilnot long before a change. Never hurt anything, but can't prove that it really helps as I have never had problems that would require it.

BEEN USING MMO FOR 30+ YEARS. I ALWAY HAD GOOD RESULTS WITH IT, IN OIL OR FUEL.

Great video. I really appreciate your honesty. Thank You for your time and input

Marvel Mystery Oil works great, use it in my cars, use it mixed 50/50 with alcohol to recharge my k&n filters, mix it with mineral spirits as a penetrating oil, use it for air tool oil, great stuff, GO STEELERS!

Great Product, I've used it since 1975, substituting one quart oil with MMO in gasoline and diesel engines oil changes. In Diesel I ran it in the fuel as well and never had injector related issues friends had. But where it really shined was in my F250 Super Duty, Ford had a class action law suit filed against them because the 5.4L triton engines would rap a couple of times on cold days when initially started because of a design flaw in the length of the piston skirts. My Super Duty Never experienced this until one oil change that my local Autozone was out of MMO and I only had synthetic 5W30 in the crank case. Because MMO is like a light machine oil, it thins your motor oils viscosity and when cold your oil system pressure rises faster and your engine is less oil starved at startup. I have not missed putting MMO in my oil since, even in my C7.

you are a pro sir

I agree with your takes on Marvel Mystery Oil. Newer cars don't need it and some can be damaged like those with variable valve timing but you didn't mention how good it still is for air-cooled and two-stroke engines. Old motorcycles lawnmowers snowmobiles and snowblowers love it.

One thing to consider using this or even switching to synthetic oil is cleaning the engine out and creating an oil leak you didn't have before. Happened to me when I used synthetic oil and got a rear main leak a few weeks later.

I use this for about 20yrs .. added to my oil and gas .. this works .. best on the market ..

I agree with your statements that the only definitive proof of a product working- is a complete teardown before and after usage, and closely examining the wear surfaces and areas that usually harbor buildup. Personally- I always flush the engine with 1 quart of kerosene, high idle @1,500 RPM >10 minutes, and drain hot- and always change the filter.

Very interesting, and down to earth information. I look forward to seeing new videos, after having subscribed to your channel Robert!

Think he hit on something, In the seventies I did transmission fluid in the oil like he said and if you read up on what MMO does you will probably find out that there is no difference in the two, They both have detergents and seal restoration abilities, we would substitute one quart of Trans fluid and run for 100 miles that would actually restore lifters that were notability Clicking with in that mileage frame

Best stuff you can buy for the money don't let the price deter you.

Good info. Thanks.

From the 30's through the 60's there were MMO adders sold for cars. On an old car sometimes you'll see one, usually mounted to the firewall, they had a vacuum line to bleed it slowly to lube the top end. I've seem a lot of them, they were about as popular as the old "Frantz" bypass oil filter from the days before full flow filters came on cars from the factory.

First off, i dont know if it or any additive really does its job. One thing you have repeated and rings true over your videos is "Propper maintainance", that is the best advice any car owner needs, its 100% true and logical. That marvel product ive never seen before, but it makes me worry about there instant milk powder ha ha :-D, does it make your tea/coffee wash off the cups easyer :)

excellent video. I like the level of background/historical information on the product. MMO seems to be a good choice for additives, I think people overuse many additives. I saw some people comment on seafoam, that product is made for 2 stroke engines.

Used it in my son's old truck that had a valve tap added it to the oil. 2 days later tap was gone . do you know what's in Marvel Mystery Oil ???????????? I don't Either that's why its called Mystery Oil

I could tell you have been around for long time to know some things in the past and how times and things have changed. Younger people mostly don't know these things because of not working on things. Hands on. You know. Cars like you said if they have 100,000 k the was a good life for the car. Now cars are made much better and last longer. And the quality of Oil's filters have improved over the years etc.

Well I put MMO in my truck about a month ago, 159k miles on my 98 f150 and It stopped my slow oil leak, I would have about 1/4 of my oil missing every full tank I go through so every full tank I would add oil. It stopped the leak it has been only a month but its been through a couple of gas tanks full and the oil level is still topped off. I added just a little bit of MMO not much but I only added it once and it seems to be doing well!

Robert good video. On my older vehicles I drain my oil and fill up my engine with ATF plus new oil filter and idle for 15-20 minutes the drain. Fill up with engine oil with another filter and add half a quart into engine to build up oil while driving. 4- 5 quarts of engine oil with half quart of ATF. I learned this years ago from Auto Technician.

Can this be used in any oil? For instance my manual transmission takes automatic trnsnission fluid, would i gain anything from putting this in a manual trans, or is it just for engines?

i use this in all motors and my air compressor i can say this my motors do not blow up and i drive em hard i agree with this guy Never had a ever a major failure using this stuff