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Old 05-01-2019, 09:35 AM
mlanuto mlanuto is offline
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Mein Auto: 645ci
Oil leak only when car is off

My 2005 645ci has an oil leak, its pretty slow and seems to only leaks when the car is off. I have to top up the oil at least once per week. Car has 141,000 miles.

I first noticed it when I hadn't driven it for about a month, I topped it up and took it on the road. drives fine and smooth. I kept an eye on it for a while, ran the engine to see if it leaks and was able to conclude that it only leaks when the car is off.

when I went to perform an oil change I realized that when the front is jacked up the leak is much more severe.

My thoughts are valve cover gaskets/upper timing cover gaskets, mainly because they are known to fail and I haven't yet done them in the 50,000 miles i've owned it. However, because it seems as though it only leaks when its off - makes me think that when the oil settles back into the oil pan there might be a failing oil pan gasket.

I don't believe it is the alternator bracket leak as it would be a heavier leak and on the drivers side, whereas this leak is mainly on the passenger side.

Im not sure why the pictures uploaded upside down, but still should give an understanding of where its leaking from.

any thought would be great and much appreciated!
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Last edited by mlanuto; 05-01-2019 at 09:39 AM. Reason: upload picture
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  #2  
Old 05-01-2019, 10:05 AM
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Hsurf Hsurf is offline
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Mein Auto: E63 645ci
The oil is leaking from that hole because it's pooled on the upper side of your reinforcement plate, unfortunately that covers the bulk of the underside of the engine. I've found and endoscope helps massively with this type of problem and allows you to see in all the nooks and crannies of the engine without much or any engine strip down or cover removal.
You'll probably find that the engine is actually leaking while running and under pressure but you don't see it until after you've stopped because its still making it's way down to the reinforcement plate which is the lowest point, if your convinced its definitely the passenger side then with the engine cool run your fingers along the underside of the valve cover (it overhangs the side of the engine so is really difficult to see properly) and also check the timing cover, vacuum pump and oil pressure switch located on the timing cover itself, these are the most common leak points on that side.
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Old 05-01-2019, 05:22 PM
HerbP HerbP is offline
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Mein Auto: 05 645Ci, 14 750 M-Sport
If your leak is mainly on the passenger side, the vacuum pump would be prime suspect. As stated above, you only see the oil when the car stops, is due to the lower body panel holding the oil, until it finds a way out. Clean your engine very good with the lower panel off, then watch the engine while it warms up with a good flashlight. Once the engine gets warm, the oil will start to leak from somewhere.'

A easier way to find your leak is to use a smoke machine, & it will be very easy to find the source of your problems. At 50k miles on the gaskets, they are probably shot!
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