Catch Can Contents

Sorry to hear about your brother. Hope you are doing better health wise after your hospital stay. Will keep you in my thoughts and prayers.

I know its cheesy but AI created this list of potential causes for high crankcase pressure. Of course if that is what is actually going on here, seems plausible to force oil up and out of the PCV that way, but of course verify.

Worn piston rings or cylinder walls:

As engine components wear over time, gaps between piston rings and cylinder walls can increase, allowing more combustion gases to leak into the crankcase (known as blow-by).

Blocked or malfunctioning exhaust gas recirculation (EGR) system:

A blocked EGR system can allow pressure to build up in the crankcase.

Leaking turbocharger oil seals:

Faulty turbo seals can allow compressed air to leak into the turbo oil drain, pressurizing the crankcase.

Clogged or inadequate crankcase ventilation system:

A blocked PCV valve, oil separator, or ventilation hoses can prevent proper venting of crankcase gases.

Head gasket issues:

A failing head gasket can allow combustion gases to enter the crankcase.

Carbon buildup:

Carbon deposits can cause piston rings to stick in their grooves, leading to increased blow-by.

Turbocharger issues:

A malfunctioning turbocharger can potentially force compressed air into the engine's oil system, increasing crankcase pressure.

Inadequate oil drain back from the turbocharger:

If oil cannot drain properly from the turbo back to the engine, it can contribute to increased crankcase pressure.

Thank you everyone for your thoughts and responses.


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I've put about 500 miles on since my last oil change and when I checked the can it had a couple tablespoons maybe. However, it looked brown! The color of chocolate milk. I checked the dipstick and it looked ok there. Not sure what that is from. I did take the cap off the oil fill and had someone rev the engine but there didn't seem to be a lot of pressure comming out. I was able to lay a paper towel over it and it didn't blow it off. It didn't even move. The oil looked ok here as well. So, I'm not sure what's going on.

Usually the forbidden chocolate milk is aerated oil and water.

This. Chocolate milk shake.


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Yeah, I don’t get it. I’m tired of dealing with it. I’m not in a good place right now and feel like just driving it until it blows up! It just doesn’t make any sense for the oil in the engine to be normal but like chocolate milk in the catch can. I seem to have fixed one issue and now there’s another one. Feeling very frustrated right now.


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See post #15. How hard is it to give it a try?

I put my catch can on week one. Changed oil at 850miles. Catch can had about a tablespoon or so in it. More than I thought I'd find to be honest after only 850 miles. I guess thats normal. I'll check again after a few thousand more miles to see how its accumulating. I'm pretty happy with the catch can doing its job keeping that funk our of the intake path.

I’m sorry, I don’t understand. If I pull the can, all that crap will be going right into the intake. It’s the only thing indicating there is an issue also. If I pull it and take the vehicle in, I won’t have anything to show them there is an issue.


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Catch cans catch oil vapor and water vapor (condensation). The water comes from cold engines heating up and creating condensation. If your oil from the dipstick and from oil changes looks like it should color wise, I wouldn't woirry about that.

The large issue you were having was excessive oil consumption. Take it to the dealer with or without the catch can installed (this was already communicated in previous posts), tell them you check your oil often and that it is using excessive oil and have them check everything that could cause that. Hopefully they find an issue and fix it. Worst case, you have the concern documented and be sure to get a full write up of their checks and findings.This may help if they say everything is fine and you in fact have an issue related to this down the road.

You may want to consider dropping your oil and checking it.. Have you tried to verify it isn't a failing head gasket? They can progressively fail and not manifest itself in much more than what appears as extra/excess blow by..

The oil in the engine is fine. I checked it on the dipstick and also when I had the oil fill cap off with the engine running. I think @Caster has it right about condensation.


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