If you remove the oil level sensor at the front of the sump, you can flush the bottom of the pan by pumping oil in the front and draining it out the back through the regular port. It helps to use a heated oil flushing agent such as BP to help dissolve any build-up. you can use a flexible hose to get inside the sump. This is much easier than dropping the pan.

It is also not a bad idea to remove the valve cover and take a look. Sludge is less likely to collect up there, but you will get an idea about build-up. I sucked out all of the residual oil from up there and cleaned away deposits on the surfaces that I could access. Be sure to replace the oil up there before closing up the valve cover. This will help at start-up.

I followed this procedure while switching the 91 9k that I bought used with 100k miles from unknown oil to Mobil 1 10W30. I also ran for about 1000 miles with semi-synthetic Mobil Oil with extra cleaning agents before switching to full synthetic.

Any comments?

posted by 198.36.9...

• Beware the SLUDGE!!!! $$$$, kmosabi, Thu, 5 Dec 2002 10:04:40
  • any chance it was Q.state or Penzoil?????, Danc, Fri, 6 Dec 2002 05:17:33
    • Re: any chance it was Q.state or Penzoil?????, Winder, Fri, 6 Dec 2002 13:13:27
      • I concur, QState/Pennz will not clean engine, Lu, Sat, 7 Dec 2002 08:12:07
    • Penzoil, Patrick, Fri, 6 Dec 2002 13:07:35
  • SLUDGE>?!, Vermont9k, Thu, 5 Dec 2002 21:31:01
    • Re: SLUDGE>?!, Nick , Fri, 6 Dec 2002 21:44:40
    • Re: SLUDGE>?!, Dick in Falls Church, Thu, 5 Dec 2002 21:31:54
    • Re: SLUDGE>?!, Jim Moncrief, Thu, 5 Dec 2002 21:31:29
      • Re: SLUDGE>?! Check, BobS, Fri, 6 Dec 2002 13:59:14
  • i'm sceptical..., Andrew , Thu, 5 Dec 2002 12:11:12
    • Re: i'm sceptical..., kmosabi, Thu, 5 Dec 2002 13:00:13
  • It seems to be a "new" problem created by something, Anders, Thu, 5 Dec 2002 11:28:14
    • Both of you have good theories,, Anders, Thu, 5 Dec 2002 14:53:18
    • I wonder..., Eric Law, Thu, 5 Dec 2002 14:28:14
      • As I understand it,..., Jim Moncrief, Thu, 5 Dec 2002 15:42:30
    • Would it have anything to do with..................., pursang, Thu, 5 Dec 2002 12:54:03
  • Re: Beware the SLUDGE!!!! $$$$, Dick in Falls Church, Thu, 5 Dec 2002 10:49:00
  • Sludge? Oil-changer's fault, Steve Brown, Thu, 5 Dec 2002 10:21:34
    • I suggest flushing the sump from oil level sensor port, SaabHeir, Fri, 6 Dec 2002 09:24:01 <-- Viewing This Message
    • I guess I'm a half-arsed mechanic., Jimbo, Thu, 5 Dec 2002 10:40:39
      • Re: I guess I'm a half-arsed mechanic., Steve Brown, Thu, 5 Dec 2002 10:54:43
    • Yep, previous owners...., kmosabi, Thu, 5 Dec 2002 10:26:31

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