Foam in the oil fill cap

[sicnik]

I just changed my oil for the first time on the Kj today, and I noticed when I took the oil fill cap off there was a yellow colored foam on the inside of the cap and in the funnel. The lady that owned it before me used a syn-blend. Any ideas what this is? I was thinking water but didnt see any in the oil I drained out. would condensation cause it?

Nick

 

[Marlon_JB2]

I just changed my oil for the first time on the Kj today, and I noticed when I took the oil fill cap off there was a yellow colored foam on the inside of the cap and in the funnel. The lady that owned it before me used a syn-blend. Any ideas what this is? I was thinking water but didnt see any in the oil I drained out. would condensation cause it?

Nick

You got it. It is condensation. Nothing to worry about. Pretty much all of them do it.

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[Dave]

Looks like scrambled eggs.

Clean that out - it hurts my eyes.

Dave

 

[valvestem]

Yellow Sludge

I been told by one of the oil change places that all the Libs do it, and one of the other Jeep models too with the extended oil fill tube. kopkrab.gif

 

[2003KJ]

Funny....not noticing any on mine......i'll have to look next on the next change, as i've done a lot of city driving, rather short (compared to normal) distances, and it doesn't get driven as often as it used to.

 

[dnm45227]

our neon did it, haven't checked the kj's.

 

[Cableguy]

You got it. It is condensation. Nothing to worry about. Pretty much all of them do it.

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[JJsKJ]

The year I bought my first KJ (2003) I noticed it happen on the 2nd and 3rd oil changes but it was a rainy winter that year. I have not seen it since then though. Pretty sure it is most common in more humid environments.

 

[sicnik]

It has been cold and wet here the last month or so. I'm just glad its not something serious. thanks for the feedback

Nick

 

[Mangate]

I think this is due to the oil filler tube being so long and also being made of plastic. It doesn't get hot enough to evaporate the moisture.
I get very little of this, just a slight yellow mark between the cap and the tube. I think it also varies with different makes of oil. I once used Duckhams in an Alfa Romeo it it produced heaps of mayonaise, changed to Castrol and I had no problem.

 

[fujitsubo]

I use regular oil and don't have any problems of foam.

fuji

 

[thecause17]

http://www.jeepkj.com/forums/viewtopic.php?t=6074