Yellow Sludge Found on Oil Cap

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  1. #1
    Join Date
    Sep 2009


    99 V6 passat with 119,500 miles. Been running great. Go to change oil and removing oil cap I see a lot of yellow sludge built up. I've read that it could be due to not allowing the engine to fully warm up and taking lots of short trips especially in the winter time, but is there any additional specific notes about the passat? Any seals that probably need to be checked / looked at?
    Last edited by jazzmasterflex; 02-21-2010 at 03:28 PM.

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  3. #2
    Join Date
    Jan 2008

    yellow crud

    I found the same yellow sludge when I changed out my pcv valve. Let me know if you find out what it is and whether it has any significance.

  4. #3
    5th Gear
    Join Date
    Mar 2006
    montreal, quebec
    sister has that yellow slime under the cap and loosing coolant somewhere in her mk4 jetta

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  6. #4
    PZ is offline
    Join Date
    May 2002
    Grapevine TX. 01 4M
    It's normal with cold weather/short trips.

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