240D oil leak? - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 10-03-2008, 04:21 PM Thread Starter
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240D oil leak?

Hi, This behavior seemed to start when I changed the oil. I changed the oil pretty much first thing when I bought the car since I had no idea how long it had been since it was last done. I ordered a filter from autozone, was some fram brand. The filter looked nothing like the one that was in before, but it seemed to fit fine. After a week I noticed there was some oil leaking from the filter canister so I tightened it up a bit and it seemed to stop. I never took it on the highway for about a month (pretty much always under 45mph). Now I must drive daily ~30miles on the highway (~65mph). After the first drive I noticed the oil level went down from about halfway between the marks to near the very end of stick after only 30 miles! I can't see how the engine could be burning the oil (engine is not smoking, no oil in the exhaust).

So yea... I guess it must be leaking. Should I order a proper filter and hope that it has better seals? Is there some other trick I am missing?
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post #2 of 4 (permalink) Old 10-04-2008, 05:24 AM
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I would suggest that you buy the correct OE filter. That would mean a Mann, Hengst, Knecht/Mahle or a Mercedes boxed filter. They come with an O ring that needs to be replaced each time the oil is changed. The old O ring must be removed too. Don't leave two of them in there. It will leak with zero or two O rings. You can change the filter now without having to drain the oil you just changed. If it is leaking, however, you ought to see evidence of that.

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post #3 of 4 (permalink) Old 10-04-2008, 03:56 PM
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You may want to check if during your last filter change you removed the old o ring from the filter housing before installing the new o ring. The grove on the filter housing is deep enough to accomodate 2 orings at a time. If you did not remove the old o ring the stacked o ring configuration is no match for 45+ psi from the oil pump.
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post #4 of 4 (permalink) Old 10-04-2008, 07:10 PM
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^ +1. I've heard that one quite a bit.

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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