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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 01-21-2013, 01:46 PM
mayhofer25 mayhofer25 is offline
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Location: phoenix
 
Join Date: Jan 2013
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Mein Auto: 2002 325i
water in oil

i have water on my oil filler cap but not on the dipstick inside the motor..?
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  #2  
Old 01-21-2013, 02:21 PM
joegr joegr is offline
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Location: Gulfport, MS
 
Join Date: Aug 2012
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Mein Auto: 2002 325i
In the right conditions, a little condensation is okay. The important question is is it water or coolant. No amount of coolant in the crankcase is okay.
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Old 01-21-2013, 02:49 PM
GoForthFast GoForthFast is offline
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Location: New York
 
Join Date: Jul 2004
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Mein Auto: '04 330Ci 6-speed
Could you give us a little more background on the recent history of your car? Driven hard? High mileage? Overheated?
Your first post doesn't exactly give us a lot to go on.
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Old 01-21-2013, 03:17 PM
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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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