yellow sludge in oil fill cap

Discussion in 'KJ General Discussion' started by b2, Jan 18, 2007.

  1. jeepkj02

    jeepkj02 Full Access Member

    Messages:
    1,021
    Likes Received:
    5
    Joined:
    Mar 25, 2005
    Location:
    Holland, Michigan, USA
    Funny....I'm getting sludge also, but I'm running Mobil 1 Syn, and most of my trips are over 30 miles long. I took off my PVC valve/hose and sprayed it with throttle body cleaner to clean the yellow sludge and wiped off the sludge in the filler cap.
     
  2. Dave

    Dave Administrator Administrator Moderator

    Messages:
    15,590
    Likes Received:
    6
    Joined:
    Feb 22, 2006
    Location:
    on here
    Ok, so I got 2 vehicles and the Kj only has the goo. So I'm thinking it might have something to do with the plastic oil filler. It does not get as hot as metal (aluminum motor head) so the condensation collects there and turns to poo??? My car with no plastic filler (just aluminum head) and only a plastic cap that screws right into the aluminum head. It does not do this. Not even on the plastic cap. Both are driven in a similar way/trips, etc.

    Could there be anything to this thought?? Am I making any sense??

    Someone help me out here. Thoughts???

    Dave
     
  3. JeepJeepster

    JeepJeepster Full Access Member

    Messages:
    8,412
    Likes Received:
    8
    Joined:
    Dec 15, 2004
    Location:
    Dem hollers in Ky
    I would say it has more to do with the way the engine is built internally than anything else.

    But yes, hot air could be coming out of the head up into the oil filler neck and condensing. Thats why it only happens in the winter since the engine bay is alot cooler. This also means it has nothing to do with the oil but could still have something to do with how long you drive it. The hotter the engine bay gets the less it will condense. Just throwing ideas out.
     
  4. a4dp

    a4dp Full Access Member

    Messages:
    95
    Likes Received:
    0
    Joined:
    Aug 22, 2007
    Location:
    Henryville, IN
    Yeah, I was wondering the same thing. Does anyone make a metal fill tube? I'd like to try it and see if it helps any.
     
  5. rockymountain

    rockymountain Full Access Member

    Messages:
    1,718
    Likes Received:
    2
    Joined:
    Apr 20, 2007
    Location:
    Spencerville, IN
    I'll second that! probably won't find one though.