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Yellow oil sludge on oil cap


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Old 12-24-2009, 06:21 PM   #1 (permalink)
 
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Default Yellow oil sludge on oil cap


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While adding oil to the old jeep today I noticed this yellow milky fluid on the cap and down the filler tube. I have seen it before but never really wondered what it was. I took the baffle out and cleaned it all out. Also I checked the PCV valve and hoses and everything is working the way it should. I check my fluids regularly so I know itís not coming from the coolant, so it has to be in the oil. I figure it's was the wax in the oil, I use Castrol GTX 10W-30. Anyone know what it is?
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Old 12-24-2009, 06:23 PM   #2 (permalink)
 
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Normal for Mopars. My durango does it as well. Nothing to worry about.
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Old 12-24-2009, 06:35 PM   #3 (permalink)
 
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Mine does not do that,looks to be moisture.
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Old 12-24-2009, 06:38 PM   #4 (permalink)
 
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That is from condensation,to many short trips where the engine does not get fully warmed up to burn off the condensation that forms inside of the engine.

It's normal for all vehicles that see many short trips,just more easily seen in newer MOPAR's due to where the oil fill is(3.7's,4.7's,and HEMI's use the same oil full).
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Old 12-24-2009, 07:06 PM   #5 (permalink)
 
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That’s odd because I don’t have a short trip to work every day, hell I wish I did. It's a half an hour drive one way and it’s all 55 MPH for the most part. So I would figure that would be long enough to burn off the excess water. I would agree its condensation of some kind.
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Old 12-24-2009, 07:08 PM   #6 (permalink)
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TJKJ2002 hit the nail, it's from condensation, no worries, just wipe it off.
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Old 12-24-2009, 07:09 PM   #7 (permalink)
 
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Originally Posted by JeepKj03 View Post
Thatís odd because I donít have a short trip to work every day, hell I wish I did. It's a half an hour drive one way and itís all 55 MPH for the most part. So I would figure that would be long enough to burn off the excess water. I would agree its condensation of some kind.
Well then it's time for better oil,try 5w-30 since it's the best speced weight for the KJ.
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Old 12-24-2009, 07:53 PM   #8 (permalink)
 
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I concur with TJKJ2002. Mine only does it when it's cold out. Could just be condensation that forms when the engine cools and it shows up there.
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Old 12-25-2009, 02:39 AM   #9 (permalink)
 
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Sludge city. You should check your PCV valve as well.
I had a tiny bit on my oil cap, but nothin like that.
I used Varsol, to clean the cap underneath.
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Old 12-25-2009, 09:53 AM   #10 (permalink)
 
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Yep. It's from condensation. I'm not entirely convinced it's just from short trips though, at least not on the KJ.

See. The PCV valve draws up warm crankcase air into the oil filler neck where it condenses and turns into that milky looking stuff as it mixes with the oil residue in the filler neck.

In some cases of extremely cold temperatures the condensation freezes in the PCV valve rendering it useless. Thus the TSB D/C put out revising the oil filler neck and PCV system for early KJ's such as the '03. If you look at the later models, the PCV system is different from the factory.

TSB - 2500108
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