A-Class (W177) (V177) 2018 to present

Oil Cap residue

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Old 08-01-2022, 06:51 PM
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Oil Cap residue

Hello guys,

I have the 1.3 engine and i was just checking the oil cap and I saw it being like this. I haven’t seen it be so brown in any of my previous cars, is this normal? What could it be? Moisture?




Many thanks
Old 08-01-2022, 07:19 PM
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The brown stuff you see is indeed condensation from within the engine. The color ranges from brown to a thick yellow-white mayo-like sludge. It often means, but not always, a failing CCV. The CCV is supposed to vent the crankcase (like a PCV) and allow this condensation to flow back into the sump but it gets clogged by an accumulation of this condensate. In colder weather, this condensate clings to the CCV pipes/tubes, as they do not warm sufficiently on short trips to flow back into the CCV.
Best to avoid short trips and allow the car to warm sufficiently.
Old 08-01-2022, 07:22 PM
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Originally Posted by SmokinJoe
The brown stuff you see is indeed condensation from within the engine. The color ranges from brown to a thick yellow-white mayo-like sludge. It often means, but not always, a failing CCV. The CCV is supposed to vent the crankcase (like a PCV) and allow this condensation to flow back into the sump but it gets clogged by an accumulation of this condensate. In colder weather, this condensate clings to the CCV pipes/tubes, as they do not warm sufficiently on short trips to flow back into the CCV.
Best to avoid short trips and allow the car to warm sufficiently.
Thanks for your reply.
I only picked up this car 3 days ago and it was serviced before my pickup. I cleaned the residue and i will see if it shows up again as i don’t really tend to do short trips - so i am wondering if it’s from the previous owner and the mechanic didn’t clean / check it?
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