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Old 06-29-2019, 08:40 PM
Join Date: Jun 2019
Location: florida
Posts: 29
98roush is on a distinguished road
Crankcase pressure, turbos leaking oil

Figured I’d start a new thread since this doesn’t relate to my previous one

History of previous issues with it.


2010 X5 xDrive35d

So I had a intercooler completely FULL of oil. I’ve pulled off both charge hoses and started the car to find that the crankcase is Being severely pressurized and oil is heavily flowing out of the turbo outlet.

I’m aware there is a valve cover gasket that can cause issues but that is only affected by boost pressure correct?

It is possible I have a pretty oily DPF causing high exhaust pressure is there something that could cause it to back up exhaust gases into the crankcase?

Last edited by 98roush; 06-29-2019 at 10:00 PM.
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Old 06-30-2019, 10:53 AM
Join Date: Feb 2019
Location: AZ
Posts: 15
Sophisticated Redneck is on a distinguished road
I would be more suspect of your turbo oil return lines. Mine were completely clogged from coked up oil. My intercoolers were soaked in oil and it smoked like a James bond smoke screen. Replaced with new lines and it solved the issue.

Also to make sure you don't also have some issues with CCV, the only way to be sure is to add a boost/vacuum gauge to the crankcase. Just tap the oil cap and put the sender right in it. That's what I did for mine when I was designing my own catchcan and adjustable vacuum setup. Was on quite a different engine (N63) but same concept applies.

Last edited by Sophisticated Redneck; 06-30-2019 at 11:00 AM.
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