Thread: water in oil
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Old 01-21-2013, 04:17 PM
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Fast Bob Fast Bob is online now
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Join Date: Jun 2004
Posts: 35,218
Mein Auto: 2004 330Ci ZHP 3 pedals
Here`s the deal:

The oil filler cap is the highest point on the engine, so all vapors naturally migrate there, and condense as the engine cools down. This constant cycle is what causes the infamous "BMW mayo". Cars that make mostly short trips usually have a more pronounced version of this condition.
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