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Oiliy froth under engine oil fill cap?

2K views 4 replies 3 participants last post by  Lord Vader 
#1 ·
Just a noob :>) I'm looking to buy a used 325i 2.5L 02 or better so I've been doing a lot of test drives. I've noticed on all of the cars that I've driven a creamy light tan'ish froth under the oil fill cap, I pulled the dip stick oil levels looked fine no froth, is this normal. Normally this is a very bad thing? I'm a mechanic by trade just not on auto's for many years. I do all my own repairs.
Thanks Marlin
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#2 ·
It can be a sign of condensation in the engine. It usually, key word usually gets removed when you drive the car for longer periods. On short trips their isn't enough hear to get rid of it. Which is why highway miles are always better for a car then short trips.
 
#5 ·
I used to drive 40 km per way to work (80 km total per day) so I never saw that. It always got warm enough. The Milage adds up pretty good though!
 
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