Meanwhile at G&G HQ, Mark is tired, bleeding, and surrounded by the corpses of blown up 4 cylinder engines. As if there's not enough teardowns happening there, both bens are tearing down engines somewhere else too. Burning with righteous indignation, he LS swaps everything in sight. Ben's Civic is now unlimited because it makes like 500 whp. And the Eclipse is actually a good car now.
Actually, this is proof that the products you use also matters. Synthetic oil is MUCH better than conventional oil. Synthetic oil also happens to be more expensive and most people will get conventional for that exact reason. It's better to spend the extra money to get the better product and this video shows why.
I would of loved a third test vehicle running conventional oil for 5,000 miles instead of 10,000 miles. I would never run conventional oil for that long because it breaks down much quicker 😅
@Brandon-uy1uv I agree, I work at a shop and most people only go 5,000 miles between oil changes using synthetic blend. I'm pretty sure an engine with oil changes every 5,000, using conventional would have been close to what the full synthetic one looked like. The varnish on engine is mainly from oil deteriorating and breaking down. It becomes acidic and starts corroding parts. But it would have been awesome to see a third variable.
@@JDubSTSynthetic is definitely better but some engines like my Jeep 4.0 don’t like them. I tried using Amsoil synthetic I started burning oil and knocking. She’s much quieter on conventional 10w-40 now
@@waterloo123100 This is where your previous buildup and wear matters. Part of what makes synthetic 'better' than conventional oils is its uniformity of oil molecule size and generally higher detergent levels. If your Jeep was using conventional most of its life and switched to conventional the issues can come from the uniform oil molecule size getting past the oil control rings more regularly than the conventional irregular sizing hence burning more oil. Additionally the higher detergent or cleaning power of the synthetic breaks down carbon and acid related buildup which can open up gaps where wear patterns have developed. These two reasons are why it's not advisable to switch to synthetic after a long period of conventional.
Lots of comments complaining, but it was fun to watch and informative aswell. There is a need for ads and sponsorships but this way I don't mind them at all 👍
My only complaint is a lack of testing to simulate cold weather short-trips. That kind of test can expose a lot of bad aspects of cheaper synthetic oils. Especially in GDI engines.
@@hochhaul and that can be another video. They can’t get it all together all in one test I’m sure if you look around on RU-vid you might be able to find one.
@user-vh9hs4qe7r No it's an aspect of oil performance that is frequently overlooked or intentionally left out because oil companies and manufacturers know it's a major issue.
@@Tallnerdyguy these companies can afford those costs.. theyre not poor like us cats..even 200,000 km would be just as fine, not necessary to reach 800,000km
some people complaining its a 15 min Ad are wrong. it's an interesting video comparing conventionnal to synthetic oil. it could have been any other brand of oil. the test is not telling you ohh valvoline is so much better than any other. its comparing valvoline synthetic vs valvoline conventionnal The result are what i expected.. a lot more varnish and build up with conventionnal oil.
The test vehicles are Explorer engines.. I truly don’t care what oil is used, they’re shit platforms to start. 😂 maybe a coyote engine would have been, cooler.. still ford, and more enthusiasts would be enthusiastic about that power plant than this. Also, they should have had the star mechanic, Mike, be there. He would probably more geeked and enthusiastic than these two boring bens
A lot of people in the comments are complaining about the 10k oil change frequency, but seemingly fail to understand that the vast majority of people who drive vehicles with combustion engines don't know, and don't WANT to know, anything about them. If the manufacturer recommends an oil change every 10k miles, that's what most users will do (actually MOST users will probably miss that mark by a few thousand miles, I know I do more often than I'd like the admit, and I know a lot more about engines than most drivers). This test is much more realistic for what most drivers will actually do, in a vehicle that a lot more people drive than something like a Mustang. It just reaffirms that for the average driver who just wants to get from point A to point B reliably, Full Synthetic oil is the clear winner as it gives a lot more leniency on frequency of changes.
Considering Ford would recommend synthetic oils in the first place, to have run conventional oil 10,000 miles on these is crazy. I'd wager the varnish would be significantly less with 5,000 mile oil changes.
Yeah I was wondering if more frequent oil changes with conventional would help. But I imagine this is representative of the general public so makes for a realistic test in my mind.
@@vettle1 I agree 100% ,just sold my dad's 2003 Lesabre with188,000 miles always used 10w30 conventional oil every 3to 3500 miles between & had trans oil changed 3 times with a new filter every 50,000 miles never a Trans problem considering it was supposed to have a WEAK trans
Depends a lot on what their testing regime looked like. Those long oil change intervals only really work when the engine spends the vast majority of its time at moderate load and and at normal operating temp.
Love that Valvoline gave you guys the opportunity to show us the differences between the two oil types. Given it’s just their brand but still very cool to see what differences they had! Good to know I’ll still be running their 5w40 full synthetic in my 2004 STi.
I read a breakdown from a testing facility on e320 diesel engines. They said that 5w40 had significantly less wear than 5w30 or thinner. It's just not worth the mpg to go lighter if it costs you in engine life. That's assuming you plan to own the car for hundreds of thousands of miles.
10,000 mile oil change with a TURBO! Crazy, no wonder the conventional looks like hell, 3000-5000 absolute max for conventional oil. With a turbo I would go 3000, and 5000 synthetic
@@jakefish3184 oems gets CAFE credits from the EPA for longer OCIs because it creates less waste oil. It may survive the warranty period but its not ideal to do 10k mi OCIs in most cases.
Agreed. A turbo engine with conventional at 10k miles is just silly and the varnish makes too much sense with what that conventional oil is being asked to live with for that long. This test would look shockingly similar if it was 3k on conventional and 5k on synthetic.
So conventional oil is actually amazing. I’ve never heard of 10,000 mile oil change intervals using conventional oil. Shocking it held up for a whopping 500,000 miles!! 🤯🤯
Keep in mind these engines got zero hot/cold cycles and just ran and ran. It is hot/cold cycling that really kills engines, so we shouldn't be surprised by the longevity of these motors.
I'd be interested in seeing conventional at a 3-5k mile oil change interval vs the synthetic at 10k mile. Currently running Restore and Protect in my 200k mile GX470 so it's cool to see a glimpse into the engineering and testing side as it highlights where that extra cost of Valvoline actually gets spent.
Valvoline wouldn't advertise that because they don't want people realizing that 5k is better - I'd wager 5k conventional blows 10k synthetic out of the park, and neither of the engines would have noticeable issues vs the samples in the video. If they explicitly showed 5k vs 10k, they would be shooting their own marketing saying 10/15k is good in the foot. Also, regardless of if they want to or not, the rest of the auto industry is pushing for 10k changes on newer cars. If they went against the grain, people might think their oil is less reliable and buy oil from other manufacturers that say 10k is kosher.
@@SmurfHunter Valvoline would definitely prefer you change your oil every 5k miles because then they sell you twice as much oil. If they didnt think any oil could last 10k they would be showing that any chance they had.
@@SmurfHunter So Valvoline don't want people to buy their product more...? If 5K is worth it, they want you to do that, but a company with integrity won't say - You HAVE TO change at 5K - If 10K works just fine for the regular consumer. If you change every 5K that's just good business for them or any other manufacturer. Your logic here is very flawed.
@@SmurfHunter it's crazy how engineers can spend decades developing better materials for better reliability and less maintenance and people somehow still act like it's some elaborate scam
Never have I watched a video with such a detailed comparison study between the regular mineral and synthetic oil usage. Very good work and educative. Thanks for sharing 😊
For everyone who owns an ecoboost, please change your oil every 4K miles or 5K kilometers with synthetic. Sincerely, a ford gasoline engine certified technician,
First of all, your conversion from miles to km isn't even close. Second of all, it wildly depends on use case. Idling around NYC and sitting stationary for an hour to run the heat/AC every day is far different from commuting at 70 mph at steady cruise on the highway. I've changed full synthetic at 7500 miles or every 2 years (whichever comes first) in all of my cars and have not had one single mechanical issue in any of them. I could probably push 3-5 years for the lower use cars (they are all driven at least 30 minutes up to temp at least once a month), but I haven't seen enough data to push that yet.
@@nunyabusiness896 are they all ecoboosts? And im rounding off the numbers to a nice even number for the yankees i didnt want to say 3106miles. Also, 7500miles is absurd and a good way to gum everything up
Had a 14' Focus ST and thats exactly what I did till I got rear ended lmao. But I used Penzoil ultra plat every 5k miles. Even threw in Bestline for extra protection
While this is an ad, it’s very easy to not watch the video if it doesn’t interest you. These are free videos. Complaining makes zero sense. Also, Valvoline has sponsored motor sports for a very long time and have stood behind some cool projects.
I really don't see this as an ad. They could literally use any other brand and the results would be the same. It's just Valvoline in this video because well... They happen to be the sponsor for G&G.
I was happy to see Valvoline Extended Protection being the one tested. That’s exactly what I’ve been using on my 2012 ES350 I bought 2 years ago. Even with 215k, it doesn’t burn a drop. The oil always looks gold on the dip stick, never black and burnt
I want to see them really put their money where their mouth is and put the conventional oil motor back together and use the restore and protect for a few changes And show us if it really unsticks the rings and cleans the varnish.
Not if you're running constantly for 8 hours everyday. You'll reach that 10K in no time. So the oil is probably in better condition in a car reaching 10K in 2 weeks compared to a car taking 9 months to reach 10K. In this scenario, the oil is in a controlled environment. In real life, most people are driving through, dust, snow, rain etc. which all have particles that make it past the filter. Then you have Ambien temperature changes. Then you have oxidation over time. 9 months of oxidation compared to 2 weeks is a significant difference. I agree that for real life, 10K is way too long. However, in a controlled environment that sees miles adding up for 8 hours or more straight, you'll have less elapsed time between oil changes. They should have driven to and from work with these cars until it reached 500K miles. Would have been more accurate.
I bet if they changed the conventional oil every 5 it would be just about as impressive as the synthetic. Still great considering 10k which I would never do on even synthetic. I do 5 on synthetic or a bit earlier. Great video though.
Thank you, Team Valvoline for documenting this testing result! I like to run my vehicles a long time. I discontinued conventional oil for full synthetic a couple years ago and will now run nothing else except full synthetic.
Thank you Valvoline for putting this much money and time into testing and showing us. It's not really marketing. It's their conventional product vs their synthetic product. So it's just testing and wasn't cheap.
Supertech OCI every 3 to 4k miles is all the average driver ever would need ! My 94 chevy s10 with an unrebuilt 2.2 has 663,000 miles on her ! 130 oil changes ! Runs great !
really impressive to see what differences appeared after so many miles. And big thanks to Valvoline being so transparent and honest and having the possibility to see such an interesting test
@andybales7318 You are correct. They do mention that they tried to replicate daily driving by changing the throttle, but it is still a very controlled environment.
@@hollowpoint185 yes, without dust, dirt, moisture your every day environmental conditions...a bit deceiving video...a 5k would have been more interesting, as I think there would have been little difference
@@andybales7318Most people's roads aren't full of grit and grime and even if it makes it into the oil, the oil filter will catch it. But this isn't a farm vehicle test. Moisture, in most cases, is a non issue if the engine is allowed to come up to temp. As the operating temp of the oil is roughly 100C and the water will evaporate. The issues come from short trips when the engines aren't allowed to come up to temp and fuel gets past the cold rings on a regular basis, that's not happening here with these engines being run for hours and hours daily. Though again, you need to look at the results of the test. No fatal failures in 500k, most people won't reach half of that. The takeaway is that conventional can survive 10k drains under more idealistic conditions, synthetic can do it easily if you don't do a lot of short trips.
@@Vermonstered not sure where u drive that the roads are clean 🤣 not in big cities, that's for sure...if 10k work for u, go for it...there's a reason they keep lowering the interval rates with synthetic oils......if u recall, it was 15k when the hype started...now, many experts suggest 5k which conventional can do just fine...personally I do synthetic blend 5w20 in my 20' Ford SUV which the manual calls for at 5-7k as I do alot of highway driving..my 03 Ford truck synthetic blend 5w20 every 4-5k...both run fantastic
How cool is it that you get to partner with such a huge and historied brand like Valvoline. I'm so glad I only use synthetic in my vehicles. This really gave me more peace of mind.
I'm sure some people will whinge about this but personally, thanks for doing it. No way would I ever get to see this otherwise and I love this stuff. Very cool test, really well done video, I want to work for Valvoline now 😂
Honestly this is very impressive. As a car enthusiast this really excites me to see real world results behind products people produce. Great job Valvoline
As a shop owner, I am happy to say that I've been using Valvoline exclusively for at least 8 years ...and I have seen cases of varnish build-up reversal several times in that time. Great upload guys!
I'm 53 and have run a competitor's brand (starts with the letter M) full-synthetic for 32 years in everything I've owned; cars, pickups, SUVs and sportbikes. After drag racing old-school air/oil-cooled GSXRs in the '90s I became a huge believer in synthetic oil and how well it protects parts from wear.
I've been telling people for a long time that Ford's Duratec/Ecoboosts motors are fairly stout. I saw several of the with 300,000+ miles working at the Ford dealership.
This is the type of sponsored content that I will genuinely enjoy watching and make me be like "Oh actually maybe I will spend a bit more and get valvoline" Unlike completed unrelated videos doing shaddow legends or manscape ads etc
This is great. I still can't get myself to go 10,000 miles on a oil change and I don't think I ever will. 5 to 6 thousand is what I usually do with full synthetic.
I read a response from an engineer(on Reddit so take that for what you will) and it's how to calculate intervals. Intervals should be based on gallons of fuel consumed and oil capacity since combustion byproducts are what degrade oils. It's as follows: 1) look up vehicles oil capacity and multiply number by 50 2) this number is the number of gallons of fuel you can consume before requiring an oil change 3) convert this number to miles based on your vehicle's gas mileage average. Simple calculation that I've used and is highly recommended by various "experts" on car forums.
@@lobbyrobby I thought so as well. For me it kind of put a reasoning behind when and why we change engine oil so frequently vs trans or diffs. Makes sense as to why there are detergents in engine oil and not in other lubricants. It's the byproducts of combustion. Prior to reading that equation I never really considered some of that, and having a formula based solely on combustion byproduct entering the oil makes really good sense to me. Also happens to align perfectly with my previous notions, kind of like you.
@@timlong1462 yeah it's good to see my intervals make sense. To me driving habits and conditions should also play a part tho too. Most of my miles are highway miles. If they were mostly city miles (stop and go all day) I'd probably change it more often. Or say towing miles.
I'm 65 years old, I grew up in the UK, we used Castrol GTX 20W/50, regular oil, (no0 synthetics then), changes were at 10-12k Miles or each year, but in those days, (1970a-80s), we didn't expect our cars to last more than 100k miles. Now I have a 1971 classic Triumph and use High Zinc 20W/50 Synthetic, and the best synthetic U.S.A. made filers I can obtain, I change it out every 6k miles maximum. Hopefully that helps to extend the life of my expensive engine. (I really wish that Valovoline VR-1 Synthetic was easier to find locally)
Informative video as always, sponsored or not it's nice to see an actual tear down under controlled conditions. Obviously Synthetic would win out here (it better otherwise I'd have some serious questions) but a lot of people don't understand how much a difference in oil quality can make.
10,000 mile OCI for conventional is quite insane. Even when it was standard, no manufacturers ever recommended going over 5000 mile OCI for conventional, and the standard was generally 3,000 miles. I think a 5,000 mile OCI interval for the test would have been more apt.
What I learned was that the oil doesn't matter, they both made it to 500K miles and in the north, the car would have rusted out long before this point and in the south it would have been stolen and sent to mexico.
I'm in the south and have been running Valvoline full synthetic in my truck since I got it with 80k it just crossed 220k and it's a base model so nobody wants to take it so we shall see if it makes it to 500k
Note, though, the conventional had a wastegate failure and a catalytic converter failure much sooner. Not only do those cost money in parts, but also either mechanic labor and/or downtime while you get time to replace them. The timing chain was also starting to go on the conventional oil engine. Additionally, synthetics do better in a wide range of temps, so wear would've been worse in, say, extreme hot or cold climates. Direct Injection engines might also get intake runners more gunked with conventional. There's also the fact of time, conventional would likely get much worse over time over 10, 15, 20 years vs. the 4 tested here. Overall, the savings of $20 or whatever it is per oil change isn't worth the penalties. To me, the labor/hassle of an oil change is far greater than the cost of the oil.
@@juliogonzo2718 I think the cats in both cases ran hotter bc the cars were stationary and didn’t get the normal airflow. Bad wastegate was still due to oil, so an example of cascading failures.
It would’ve been nice to get a compression and leak down test on both motors as well as an oil analysis. I can’t imagine what the viscosity of both oils are after a 10,000 mile service interval. That is crazy.
The stuck rings are something I've been noticing as a wildly under-represented failure mode in popular understanding of things. People still talk about rings and bores wearing out, you can clearly see here that's basically not an issue, modern engines exhibit very little wear in the cylinder walls and rings. The biggest issue for oil consumption and compression loss is stuck rings due to carbon deposits. I'd be interested to see someone take something like a famously oil consuming Subaru, run it on restore and protect and see if the oil can actually clean those deposits and return cylinder seal.
Anecdotal evidence, but I've been running R&P in a couple of old Priuses, which are notorious for the oil control rings getting stuck/clogged and burning an excessive amount of oil. On the first one, I did a quick basic clean with some Seafoam in the oil for ~100 miles before changing the oil, then changed the oil with some regular off the shelf synthetic oil. Consumption from just doing the seafoam cleaning dropped from ~1qt/2000mi to ~0.8qt/4500mi. I changed that oil with Valvoline R&P about 4k miles ago, and I'm still at about halfway between the marks on the dipstick. Too close to tell if it's done anything yet, maybe a slight improvement, but that could just be due to how it's been driven or something. However, what I have noticed is that the engine does seem to be smoother. Cold starts and engine engagements aren't as rough, and the VVT rattle on cold startups seems to be completely gone. I'm changing it next week for another round of R&P. On the second car, I bought it and it had been pretty abused, similar mileage to the first. Oil consumption was ~1.5qt/3000mi. It's currently sitting at ~4500mi with Valvoline R&P and I did top off the oil once before a long trip, so I'd estimate it's burned ~1.25qt in the 4500 miles. Definitely an improvement, and it'll be changed with R&P again and I'll continue to monitor. Similar story to the first, smoother starts, no VVT noise, etc.
@@Black-Villain Interesting stuff! I also have a shitbox Prius, I'll have to try some of that. It's currently down with a bad head gasket but we'll see how the head looks inside with 280k miles when I crack it open. Sounds like the seafoam might be a better solution for severe cases initially.
@@Levibetz Yes that's what I think as well. R&P definitely does seem to be doing what it says, I can tell by the change in the oil deposit/varnish color just by looking in the oil fill hole. However it seems to be pretty mild, so I believe their claims about it needing 4 Oil Change Intervals to properly do its job. For severe buildup/deposit cases, some kind of oil flush is definitely the more aggressive option.
I found this very informative and helpful! I have a 2008 vehicle approaching 170k miles. This is encouraging that I can still preserve my car by staying on top of the maintenance. I always use synthetic, but now I think I'll go to Valvoline for my next oil change. Thanks!
Fun, informative, and y’all already had me buying Valvoline. It’s in my engine, transmission, and diff. Hopefully this means Ben Lin has recouped the cost of buying a Pennsylvania car.
This was super dope to see! I just recently got my oil changed with Mobil 1 Full Synthetic oil and I’m never going back to synthetic blend ever again. Thanks for this video fellas!
Great video. I'm in the UK and have been using fully synthetic oil in my cars for years. Anything from 2.5 v6 petrol, to 2.0 inline 4 diesels and service them both every 10-15000 miles without issue. Then again, that's the typical service interval we've followed here for years. Some car manufacturers now claim you can go 30,000 miles between oil changes but I think that's a bit much and wouldn't risk it.
@@KG_BM i have seen what a quality oil is priced at in the states and it is so cheap i can’t understand why you wouldn’t use it. It’s like 25USD for a gallon.
Not all cars work well on synthetics. For example, they're not very suitable for rotaries as when they break down they leave heavy carbon deposits and risk extra friction on the apex seals
I am not surprised that the synthetic oil engine is in it’s current condition. I have other similar experiences that are about the same. The conventional oil engine was surprisingly in good condition also. The build up on the surfaces is actually not too bad. We must of course keep in mine that both of these engines were operated on a regular schedule. Unfortunately in the real world getting proper maintenance is not always performed on a regular basis. I have been using Valvoline products for several decades and I have settled on the Extended Protection high mileage on most of my vehicles. I did however try the Valvoline Restore and Protect on an old pickup truck with over 350,000 miles on the original engine. The jury is still out as to how well it will clean up this old engine but so far it is definitely running smoother than it previously had. I ran the oil for about 300 miles and I changed the filter per recommendation. I cut the filter open and was surprised at how much carbon and sludge that was present. I only use Wix filters and I routinely cut them open after every oil change. I do this mostly to monitor metallic particulates. I was a research and development engineer for two major motorcycle companies so old habits die hard. I have been using Valvoline products for about 60 years and I am quite happy with them.
Now i would probably complain if the " bad product " would have been called "no name brand, but is same company testing difference of reliability of 2 of their products. If my 15 y/o van was run for half of its life on standard oil , the fact that i used sintetic oil would just delay the inevitable but won t fix it. I had no idea why the difference until now i was choosing sintetic just bc i m lazy and get to run 3000 km more without changing the oil. Now i finally have an explanation and being lazy payed off. Thanks for the upload , really worth the time watching this video
This is an awesome video. I think it gives companies credibility when they can admit some negative things about their own product. I get skeptical when companies only say positive things. Excellent comparison!
This is such a great video, I don't mind that it's an ad. I really wish Mobil 1 did stuff like this as they're the brand that I use, I'm sure they preform similiarly
@@christians131 I never said what Blackstone recommends. I said Blackstone oil analysis shows that Mobil 1 is not Inferior like the commenter before you stated. And yes I drive in harsh conditions. I live in the the mojave desert very hot and dusty summers and freezing temp winters.
Good test. I'm impressed with the conventional tbh. But I'm most impressed with how you managed to find two explorers to last 500k miles without grenading at around 180k.
I'm in my 50's and have been rebuilding engines for decades. Just like the video, I can tell instantly when removing a valve cover what type of oil the vehicle ran with. Back in the 80's oil technology wasn't really developed. All engines had burnt oil in the valve covers after 100K. Sludge was also common. Its a dead giveaway, today. Yup the previous owner cared about their vehicle.
The weak points in this test is the lack of dry starts and no short-trip-cold-engine shutdowns. There the sludging and accelerated wear with conventional oil would be markedly increased. We know that in a same oil comparison, engines that run every day for many hours will outlast the conventional city/suburb car by many hundreds of thousands of miles. Still it is nice to see the proof of synthetic superiority under controlled conditions.
I ran full synthetic after 3,000 mile in my E150, 5.8, added a quart every 1,000, dealership said that is normal. Added dual remote oil filters, which got changed at 5,000. Changed oil and filter at 10,000. Gave it to my brother at 150,000 miles. It is at 300,000 miles and going strong. when he changed the timing cover, gasket leaked anti freeze, he said it was as clean as it was when we put 1.7 roller rockers on at 20,000. CLEAN. All my vehicles get full synthetic and have no issues.
just learned that I can go 200k miles easy and reliably with conventional oil with out worries, thats about my limit for any car anyway! and I will save 50% or more in oil changes, the next owner can worry about the inside of the engine!
This is why I use synthetic. While I use Mobil 1, not Valvoline, I only use synthetic. The thing that convinced me was opening up the engine in my old Mustang Cobra around 90k miles when a little too much boost broke a spark plug and burned a valve. The inside of that cylinder head and engine looked pristine. The cams and cylinder head looked like it had just been cast. It blew my mind. More recently, I saw one of our work vans that had an engine failure. That guy just did cheap conventional changes at Jiffy Lube or similar. I changed my own oil with synthetic. Both trucks were same year, same engine. Mine had more mileage and a larger box on it/more weight, so it worked harder. It was sitting around waiting to be sold, and the engine had been mostly disassembled until the mechanic diagnosed that it was trashed. A few of my coworkers and I lifted the unbolted valve cover and the top of the cylinder head was full of sludge and varnished beyond belief. We then went and looked at mine by just looking into the oil filler neck. It looked brand new. While I’m sure conventional vs synthetic wasn’t the only issue here (he probably wasn’t good about changing the oil), there really is a large difference. If you’re not using synthetic, you’re just making a bad decision.
Biggest fault in this test was running the conventional oil 10k miles. Of course your going to get alot of varnish and build up running conventional that long. But, test proved that it's still a good product, just that synthetic is better.
My dad has Lincoln nautilus with an updated version of this engine… I am now pretty impressed by the reliability of this engine. I’m not sure if there were any transmission issues on these test vehicles but it is pretty cool to see how these cars can go pretty well if they are taken care of.
liquid moly molygen is top tier ive tried all the top oils i stick with royal purple for all daily drivers (because i can get it at autozone) molygen for anything i want to have fun in on the weekends ive done the whole amsoil signature series idk if its worth it the molygen seems to be half the price and better or comparable
The thing that really blew my mind on this comparison was the difference in related components and buildup of carbon. I expected a huge differential in varnish and sludge. I did not expect to see so much less carbon buildup, or things like less corrosion in the coolant passages. Also, the fact that one turbo failed, and the other, with almost twice the mileage, looked so good was pretty instructive.
