Over the past two months I have been seeing a small mixture of oil and a liquid substance at the bottom of my oil cap. If I leave the car overnight and check the bottom of the oil cap in the morning I see the white milky stuff in there, but only a thin layer. It never accumulates more than 2mm high of it. It shows up nowhere else and I am not losing any oil by any means. I do have an open vent crankcase breather setup. I have also changed my headgasket last month. I have heard that this is only because of condensation and I have nothing to worry about. Is this true?

 

It's probably coolant. Is there any oil in your radiator?

 

A small amount of condensation when cold is normal. Milky substance after driving is not.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cheapmodz &raquo;</TD></TR><TR><TD CLASS="quote">A small amount of condensation when cold is normal. Milky substance after driving is not.</TD></TR></TABLE>

what he said

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by k24em2 &raquo;</TD></TR><TR><TD CLASS="quote">It's probably coolant. Is there any oil in your radiator?</TD></TR></TABLE>

No oil or coolant is mixing in the radiator or in the oil pan.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cheapmodz &raquo;</TD></TR><TR><TD CLASS="quote">A small amount of condensation when cold is normal. Milky substance after driving is not.</TD></TR></TABLE>

It doesn't appear after driving. It only appears after the car has sat overnight in the cold. It has only happened in the past 2 months and it has been near freezing temperature outside for the past two months.

So are you saying that condensation is building up beneath my oil cap every night and mixing with the small amount of oil already there?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EK k kay &raquo;</TD></TR><TR><TD CLASS="quote">It has only happened in the past 2 months and it has been near freezing temperature outside for the past two months.

So are you saying that condensation is building up beneath my oil cap every night and mixing with the small amount of oil already there?</TD></TR></TABLE>

Sounds like that's the problem. Don't freeze your motor!

When gasoline combusts with oxygen, the ideal reaction produces co2 and water vapor. Honda rings are known to be low tension, and over time allow some blow-by. With enough blow-by, you will have enough vapor in the crank case for 'dirty' dew to form under the cap.

I'd suggest doing a leakdown & comp test just in case. You may also benifit from a proper catch can setup if you aren't running one already. It will help suck that **** out of there.

 

My compression is the same as it was before being boosted: 195, 180, 185, 190 or something like that. Haven't done a leakdown in a while though. My catch can setup is using a JAZ mini breather tank (open vent) with one port hooked up to the valve cover and the other port hooked up to the black box at the back of the block with no pcv valve.