Oil catch Cans for Diesel Engines 

Very helpful advice, Brett. Having just recently myself invested in a Triton, I'm re-learning about diesel engines after 30 years and getting to know all the new tech. Plus, the delivery of information is far better these days with access to videos on RU-vid. Tremendous help! Thankyou all so much.

I must say Brett that this has been very informative as I am in the process this week of have upgrades done to my 2016 Ford Everest with 43K kms on the clock.I was suprised at the amount of soot build up in the manifold for such low kms. Articulate and concise no BS and in layman terms . Appreciated . 👍

It also coats the intake valves and, because of the heat, it gets baked on and builds up and restricts the air flow into the cylinder. Free air flow is critical for any engine but specially for diesels.

Extremely well explained. Sounds like i need one for my 7.3 powerstroke.

Mate another great educational vid. Amazing you can do all this in one take, shows your knowledge of these systems.

Very clear and informative, many thanks. It is refreshing to have someone who knows what they are doing share a high quality video. Keep up the good work.

Be nice if you could get a pressure differential sensor across your catch can just in case you forget to drain it or it prematurely clogs or restricts for whatever reason.

Thanks. Nailed it. Not the catch can. Great work on explaining. Confirmed my experimental notes. Now break pads.

Additionally you can install a Trottle body low pressure injector. The fuel pump delivering fuel from the fuel tank on a gdi has approximately 4-5 bar of pressure, so you can split the fuel line and send it to a throttle body injector. Then you could connect it to one of the electrical lines of one of the injectors on the car. This way it will spray into the manifold and clean the valves. But that can affect the mixture so the computer will compensate and send less fuel but it may not run properly so you need a switch to turn it off after a short time. It’s equivalent to cleaning the valves using a spray except you can do it much easier and more frequently. This needs to be done buy a modification specialist and it’s only an idea of what can be improved. But maybe it’s better to start with the OCC and spray maintenance then after say 7 years install this.

The explanation is correct and very good the way of the explanation on the difference between petrol and Diesel engines turbo and not turbo. I think the engine you are standing by is 4n15 from Mitsubishi

This is why port injection is still better, at least it cleans the back of the ports, and in petrol it really isn't an issue. The thing people don't seem to understand is that a lot of blow by really only happens in older worn engine or modified engines. It's also a sign of something no working right / worn. If people do install a can make sure it's big enough to not cause any back pressure as it will make seals leak or you can even blown them out. Keeping maintenance up and replacing oil at every 5k/10k is so important in diesel. Also most modern rocket covers have some sort of oil / air separation happening as well before it's sent off to the turbo.

I ran a can on my last hemi Ram for 300,000 miles and it collected a lot of crud and water vapor. Have had one on my Ram Ecodiesel for 160,000 miles and it catches about 1/2 the volume of the gas motor, Kinda makes sense as the diesel is about 1/2 the displacement of the hemi.. Gotta help keep a lot of crud out of the intake and intercooler. I drain about every 5,000 miles, maybe a bit more often in winter.

Can’t get any better then that. Explained plan and simple for anyone to understand. Good work

Very formative, I finally understand now what an oil catch can does.

Nice video Brett...that catch can looked similar to a HPD, which just use a small bit of stainless guaze.. pretty useless... the best CC are the ones with a proper filter membrane like a Mann & Hummel, pro vent etc. and with a proper filter membrane the size of the filter and CC is irrelevant provided their drained off properly.

Nice one thanks. If you haven't alredy, do one on fuel pre-filters please.

Awesome explanation, really enjoy watching your videos and hearing your thoughts.

The underside of my fairlane was coated with oil from the straight vent hose just hanging down by the suspension so i made a catch can out of pvc pipe. It had a 1 inch drain valve under the front bumper. I had to remember to drain it off every 300kms and pour it back into the sump. The carparks of 7/11s across thailand often featured a little puddle of oil from the drain off valve after emptying. Eventually after a couple of years i got pissed off with grovelling under the car so i put my boot right into it on a 950km run..... we got 935kms before no.3 rod popped out to say hello! .....just waiting for another isuzu 4jh1 engine to arrive from japan and the next catch tank will auto drain to the sump.

Excellent video Brett! Same issues with older Tdi Land Rover engines Will do a shout out on my channel soon! Mike

It’s pretty working on my 1gdftv diesel motor, I ‘be bought new one on 10 kilos on clock and I have cleaned at 10000 kilometres, my catch can was collected full of dirty grease oil combine with some water inside that engine.

Great video. It’s my first diesel so this is very helpful.

Catch cans have no advantages other than too the guy selling it, 35 years as a diesel mechanic.

I knew all this but watched anyway. Well explained, well done. I would suggest using only group 4/5 engine oils for even better blowby control in a mechanically sound engine, use of a catch can and EGR delete if possible. My D22 ZD30 Diesel Navara at 200K has minimal blowby, i must be doing something right😎

Nice and clean coming out back to turbo would require a better oil separator ie Provent or Flashlube Pro.

Excellent explanation, I have a 4m41 Mitsubishi Shogun DiD with over 200,000kms, has been dripping small amounts of oil from the Throttle body whenever the engine runs, so would say I'd have to top up about half a litre after 1000kms or so. However the curious thing is the power is still very much intact, does smoke but clears as it moves. Exhaust manifold is also clogged with carbon. Will be looking for a catch can even more so after this video, once again thanks very much.

problem for a manufacturer is that heat cycle of the engine removes moisture from the oil system - hence separating all the vapour would be trapped in the engine. Catch can can slow down fauling up of intake past egr input, but it’s on case by case.

I did not understand shit. But I can safely say that this dude knows his shit to able to articulate such in-depth technical info from the top of his head!! Much respect.

Very well informative. Thanks mate.

Hi Guys! I instaled an oil catch can on a ford Powerstroke 6.4 because there was oil on the intercooler. But i think after installation it started to burn oil through the exhaust. Does that makes any sense? Maybe too low pressure on the circuit and doesn’t goes through the turbo so it gets burned? Its usually at low rpm, when i am on the highway up a hill or flat its fine. But after traffic or iddle for a while it smokes at low and high rpm for a bit and then nothing, it looks like clears wherever its stuck?

For gas engines, a lot of blow by in your intake with lower the effective octane in the combustion chamber.

G'day, just viewed this video, excellent! There is a 2001 Prado T/diesel on my 'horizon', hence the interest. I've been driving a 1990 Volvo 240 for over ten years on extensive outback trips on dirt roads and some tracks. It is fitted with an oil separator box which drains the collected oil into the engine sump, this is a 'red block' engine with over 300k on the dial and imperceptible oil consumption. With the current oil catch cans why not drain the collected oil to the engine sump? Thank you. Stephen C.

The best simplest explain action:-) thanks

Have brought a catch can for my Ute with 27,000 on it. Was going to install it and EGR plate but have read not to do ANY EGR delete with it has a dpf. What’s your thoughts on this? Ide rather get rid of EGR crap if I can

Great video. Can you fit dual catch cans? Would that help or work?

Oil catch cans can be purchased on ebay. Either a specific type for a make/model or a universal type. Traps oil laden air from engine blow by. When can is full of oil, can be emptied. Can be fitted to standard petrol/diesel engines. Do your research if you have a performance engine. 👌🏻👍🏻

Im having issues with my Mitsubishi pajero TD. I had to cut the inlet hose and run it through the bottom of the engine bay so it can release the oil outside. Makes a huge mess outside but hopefully this catch can helps

Is any of this "circumventing" of the emissions control systems actually legal though? Surely there is an adverse effect on the engine emissions of vehicles that have had these alterations?

Is an oil catch can recommended for a Ford Ranger XLT bi-turbo (2019)?

What model or type of catch can can I use for a 4m40

Great explanation and concisely presentation! Thanks for making this!

Thank you for the video. Do you have a catch can size you would recommend for a Chevy Colorado 2.8L duramax diesel?

So good to listen to. Clear precise info well spoken word Many thanks

great video, know is a Breather Tank better than catch can and aplicable as well for triton? do we need to install a valve for negative pressure?

Wow! Great explanation. Well done.

So what's worse, black, vegimite build up in your egr/manifold that gets cleaned out occasionally (probably more often than needed) or black, gritty, abrasive exhaust gasses being sucked into your engine because they are not being caught by the oil that is now in your catch can? I'm talking turbo diesel here.

Brilliant teacher indeed.

Well explained. When you put the filter in. Do you just sit it in the hole. Or push it all the way in. As i am unsure what to do. Cheers

Probably the best video on you tube.

Does the sizes of inlet and outlet of catch can matters? My OCC inlet is 15mm with 10mm outlet.

Great pointers ,well done.

QUESTION,totally out there but please look up Peugeot 207 1.6 hdi and please help on where would be best place for a catch can and how to make it automatic empty..you seem to know what yr talking about.? Surely a catch can would help with uk emissions laws..cheers lftyr..

Thats what you do. Cable tie it to the brake lines. Sweet. Thanks.

Hi Matt, always interested in your diesel videos as I have a XV diesel. Do you know of any problems with oil pooling in the intercooler which then gets slurped into the engine, causing an over revving problem?

I have a Mitsubishi 3rd Gen Montero Sport (called Pajero Sport in some countries) which I believe is built on the same chassis and has the same engine as the latest Strada (Triton) shown in this video. I heard that the fittings on the OCC for the hoses should match the size of the current OEM hose. What OCC would you then recommend for this specific setup other than the one shown in the video?

Are you saying that engineers who design engines, modern engines up to now that do not use OCC are mistaken? How do make up for parts that get lubricated by the oil spray introduced into the intake manifold?

The best educational video about catch cans out there. Thanks.

Have heard and read that using a catch can cause valve seats to ware quicker, because no lubrication, and then changing valve clearances.....

Would be interesting to see how a catch can would be fitted to a subaru EE20. I've been thinking about this since seeing your diesel soot videos.

Danke super erklärt habe 👍 vielleicht habt ihr auch auf meine Frage eine Antwort??? es geht um den zwei Liter TDI..Macht es da Sinn eine Öl catch can zu montieren? Bitte um eine detaillierte Antwort. Danke schön

Thanks Brett Very informative, now I know what I need on my KUN26R

Hey Brett. I live in Toronto Ontario Canada. I have a ecodiesel 2016 ram 1500. Just had the EGR replaced as well the intake manifold. The manifold has the butterfly filled with soot and caused the actuator gear to crack. Due to the emissions I have to leave the EGR on the engine. What’s your recommendation to stop the oil blow by. Is there a kit for this engine specifically?? I have 147000kms on it. Please advise. Thank. By the way excellent video.

Hi, Bret. I’ve got a Jeep Grande Cherokee 3ltr Diesel 2018. It’s very tight under the bonnet for space have you ever installed a Provent or a Ryco catch can in a vehicle like mine. Some Jeep owners have suggested they have done it,but I don’t know where?

Excellent explanation, thank you. 👍

I just yanked the crank case vent pipe off and jammed on a garden hose going down to the frame rail and blanked off the other end.

Great explanation, crystal clear!

Thinking a lot of GDI engines suffer from the Carbone's up intakes believe from the PCV valve system. Do we have to fit catch cans, or can it just be vented direct atmosphere by running a longer pipe to the underside of car.

Hi Brett, Love your channel, I'm a Kiwi living in Canada. I noticed the Catch Can was made from billet aluminum, does it have any pressure relief valves? I'm sure you're familiar with the Mann ProVent Crank Case filters, I like these because of their relief valve systems. I installed one on Mk11 2.8 Pajero at 7000 klicks and at 120,000 when I sold her the intercooler and inlet manifold were squeaky clean. I use to just replace the filter elements & later on started cleaning and reusing them, worked well. I've recently made a custom bracket and installed a ProVent 200 on my 14 Porsche Cayenne Diesel, to combat the terrible carbon buildup the 3.0 VAG owners are experiencing. It's probably worse over here in Nth America, one because of the over the top emission laws and more recently, the Volkswagen diesel gate fiasco we had to endure with our 3.0 TDi's. I had my Cayenne Diesel tuned and she's a totally different machine, runs so much smoother and quieter along with the added performance. Keep on making your brilliant videos, very educational.👍 Murray

I have a small leak coming off my turbo in my d40 navara. 2014. The turbo is performing fine no loss of power etc. Can this catch can assist in containing the oil that is leaking?

Is there a filter in the catch can and you need to start the truck and show the vaper coming out of the engine and people need to start using a oil the better then a 5w30 in a diesel car or truck Especially if you live in a hot climate

When fitting a oill catch can` does it also have a regulater on it so the Air intake and crank case pressure gets regulated,as the gasses can build up pressure, Or is that only for the catch can trap that allows oil to drips back into the sump

If the inlet to catch can is at the bottom, does the oil build up and start boiling in the catch can? Something doesn't seem right to me

Do I need a catch can for 2014 outlander Mitsubishi diesel

Very helpful and informative!! Your advice on this would be greatly appreciated. Out here in the US these smaller diesels are slowly starting to catch on. I picked up a GMC Canyon with the 2.8 Duramax diesel (apparently the same motor Mitsubishi uses in some of their pick-ups). I would like to add a catch can, the only problem is all catch cans seem to work half-ass at best. All the reviews and research I've done says you simply can't collect all the vaporized oil from the crankcase ventilation without a much longer refining process, and that vaporized oil will still collect past the catch can. What are your thoughts on this? is a catch can a cure all as far as preventing build up, or is it just enough to slow the inevitable process down?

After watching your video I might install OCC on my 2017 Pajero/Montero sport A/T. Kindly advise. Thanks and more power.

I blanked my egr with 2 plates via cooler..can I put the egr back to normal by installing a OCC on my 4d56 Montero GLX 2015 to eliminate gunk build up in intake manifold.

Very informative!! Thank you.

What if the turbo is damaged and throwing oils in to intercooler which eventually goes in to combustion chamber through intake manifold ?Turbo dies slow death and by the time you know enough oil is already on intake valve.

Extremely helpful thank you

How does this fitment and tune affect the new car warranty?

I have a Ford Ranger/BT 50 2.5 Year 2008 that looks lije this "rocket cover breather system" does it mean the have no PCV valve? Ive got come oil in the turbo intake and I think its coming from the hose form de breather that goes in the air system

People still buying into the catch can garbage. The engines are designed to burn the oil vapor from the PCV (positive crankcase ventilation) system, the amount of oil vapor is very small. What these cans are doing is catching the vapor and making it look like oh my god liquid oil is flowing into the intake when that is not the case at all. Positive Crankcase Ventilation has been fed back into the intake for decades without problems, the truth is these oil catch cans are a solution in search of a non existent problem. Save your money people, if this was really a problem the manufactures would have done it themselves. All engines must have positive crankcase ventilation or they will blow gaskets from the pressure build up inside the crank case from the pistons moving up and down the cylinder walls. Before the vapors were fed back into the engine to be burned off they used to just run a hose to the ground and oil would drip onto the ground. Catch cans also can create a problem of building back pressure in the positive crankcase ventilation system when someone does not employ the catch can and it becomes restrictive you can blow a gasket and or start pumping liquid oil into the intake. If you really think you have to have something you would be far better off blocking off the PCV line into the intake and where the PCV line comes off the engine put a filter there and just change the filter on a set schedule. No expensive catch can to deal with and a simple inexpensive filter to change instead. People do this with Harley Davidson motorcycles some have put catch cans on them while others just use a simple cheap filter instead.

And what’s your suggest for the toyota 1KD-FTV engine on toyota prado or fortuner on some country? Do i need the catch can? I was wondering what is the difference between oil catch can and oil catch tank?

Can I just vent the catch can to atmosphere instead of rerouting it to intake manifold ?

Do I need an oil catch can for Subaru XV ‘19 ?

If the cars break down with out catch cans why don,t the car makers put catch cans in all their cars and vans if they were needed?

Some saying the 3.0 diesel needs on cause oil plus soot cakes on intake??

What catch can do you suggest for my 2021 GMC Sierra 3500HD 6.6 Diesel? Been shopping around but no luck...

I am just about to buy a 2013 subaru turbo diesel fitted with a catch can but I am now concerned about the environmental impact of a diesel car compared to petrol... I am planning on buying an all electric car in 5 years when hopefully they are more affordable... but in the meantime I don’t want to pollute the atmosphere even more! Can anyone please advise if a catch can helps with carbon emissions or is it purely to look after the car? TIA!

Is it okay to vent the occ outlet to air?not back to turbo inlet?will it cause issues?

Thanks, good info! 😎👍

Another great informative video. Thanks Brett.

Are the ProVent catch can better than the TerraTuff? I am thinking of getting one for my Mitsubishi Triton MR. Please, any advice?

Awesome, loved it. Thankyou

Thanks for explanation 👍

I wish I lived near you, you would get my car in a heartbeat for a diagnosis. Can you recommend anyone near Gladstone in QLD?

You can pay $300 for a catch can. Or, like I did, buy a $50 one and then modify it. At worst it'll be like not having a catch can. You can pay $1500 to have you engine intake manifold removed and decoked or you can squirt, three bond or liquid molly decoker or, apparently, use Mr Muscle.

It's been recommended that I have a " carbon" clean before fitting a catch can. What is a carbon clean?

Hi. What catch can should I use for my c class w204. Engine is a 3.0 v6 diesel commomrail with a turbo charger. Engine code is om642. Thank you in advance.

Can too much oil on a 170.000 km truck produce blue haze especially when cold?

Great information 👍👌