Foam on oil

[Leon]

Every time I change the oil on my 95 civic the oil comes out with brown foam floating. I am using M1 at extended drain intervals (i.e. change the oil every 5k miles). I used to change it every 8k but I was alarmed with the brown foam. There is no coolant loss and the engine runs great. I have not done any used oil analysis but is the foam a sign that I should change the oil more often? There was still brown foam floating on the oil both at 5k and at 8k.
TIA

 

[Spector]

Very short trips where the engine does not get hot enough to burn off condensation may cause a milky or brown sludge/foam to form on dipsticks and in oil.

If you are not taking short trips then I look forward to what others have to say about the potential cause.

 

[BOBISTHEOILGUY]

This would be a case where an oil analysis may provide you with some info as to what may be happening to your oil. That would be my suggestion.

 

[mkosem]

do you see an oily film on the top of the coolant in the overflow tank?

--Matt