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Old 02-17-2017, 03:22 PM   #1
ith5005
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Oil Leak From Oil Filler

Hi all,

I was driving home from work today and everything was fine (no lights on the dash). I got home and had to get out of my car for a minute to get something out of the garage and it smelt like burning oil. I opened the hood and saw a lot of smoke coming from the rocker cover (the cover with the oil filler cap that says BMW). It looked like oil came out of the cap and just went down the cover towards the back of the engine. Would this be due to the oil filler cap seal going bad? Or the oil cap going bad? I was just confused on the issue. The oil level was spot on, so maybe I had a little too much oil in it when i filled it a few weeks ago?

I ordered a new oil filler cap and filler cap seal to put on. Anyone have other ideas?

Thanks in advance!
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Old 02-17-2017, 03:36 PM   #2
tommy d
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Might be your CCV valve is faulty and or the system is clogged. When was it last changed? Do you drive short trips?
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Old 02-17-2017, 03:45 PM   #3
ith5005
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i think it was changed around 100k (at 140k now). I do drive short trips ~15 miles all highway though, but traffic is involved.
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Old 02-18-2017, 07:30 AM   #4
BiH55
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Yes maybe the gasket is bad or the oil filter cover is bad
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Old 02-18-2017, 09:33 AM   #5
markusmarkus
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15 mile trips aren't considered short trips. The oil filter housing cap has nothing to do with this issue. With the engine idling remove the oil fill cap. Is there a vacuum or pressure? If it's pressure the CCV needs to be checked.


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Old 02-18-2017, 11:05 AM   #6
Manolito
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Agree with Markus. In order to get visible oil loss from the oil filler cap, you would have to leave the cap completely off. If you leave the cap off, the car should idle badly because the CCV would suck a lot of air through to the intake manifold if it could not hold a vacuum in the crankcase at idle. If air does not suck inward and the car does not idle badly when you remove the oil fill cap, there is a problem with the CCV system. Start by checking all the hoses, including the drain hose from the CCV down to the dipstick tube. Make sure they are tight and not obstructed. Getting to the CCV itself is a PITA. There were some OEM CCVs that were new defective a few years ago. Hopefully you did not get one of those.
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Old 02-18-2017, 11:40 AM   #7
ith5005
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I turned the car on and let it idle itself down. I then took the filler cap off and the idle jumped between ~700-800. I then put the cap back on, immediately drops to ~550rpm then back up to stay idle at a consistent ~700.

Would this mean the CCV is not blocked? I guess the questions is what defines as rough idle? having the idle fluctuate to me is a rough idle when it should be set and not move. What do you guys think?

Yes I had the CCV replaced ~3 years ago by a BMW dealer.
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Old 02-18-2017, 05:04 PM   #8
BaliDawg
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When did you last replace the CCV and related plastic pipes?

If the answer is "I don't know" or "more than 60K" then you should probably replace them.
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Old 02-18-2017, 05:34 PM   #9
ith5005
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Around 100k miles it was all done by a BMW dealer, i had an warranty plan so that saved me $$$. But my previous post of RPM's dropping as i put the cap on should prove that the CCV is not clogged because it was pulling vacuum through the filler hole, no?
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Old 02-18-2017, 05:51 PM   #10
Manolito
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You are correct. If it reacted at all to removing the oil fill cap, there must be vacuum in the crankcase at idle, which suggests that the CCV system is probably OK. That leaves us with the original question of how it pushed so much oil out past the oil fill cap.
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Old 02-18-2017, 06:12 PM   #11
ith5005
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I agree, about a week a half ago the low oil light came on and that afternoon i put a quart in it and all was good. I then drove 200 miles two thursdays ago then sunday drove another 200. So it was run highway for good period of time.

The amount of oil on the rocker cover is enough that if you put your finger and wipe you get some oil but its not puddled. The filler gasket is high in some places. It seems to still be malleable and not hard though. I do not know if over time it got hot and warped? Just seems weird to happen of all of a sudden. Plus I follow this forum and don't recall an issue like this coming to the front page.

Like I said I ordered a new gasket and cap they should be here Monday, until then I will ride my bike (Indy finally got good weather).

Last edited by ith5005; 02-18-2017 at 06:22 PM.
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