What could cause the engine oil turned to sludge in an 2004 Pontiac Grand Prix?

Asked by Jan 06, 2016 at 02:14 PM about the 2004 Pontiac Grand Prix GTP

Question type: General

I change the oil in my Grand Prix GTP regularly.  When I took the oil plug out no oil came out of my car.  Then I took the Oil Filter off and I could not see the threads on the oil filter and there was a sludge all over the top of it.  I left the oil plug out all night to drain and all that came out was the same sludge that was on the oil filter.

5 Answers

91,415

Something does not add up. If you change the oil every 3-4,000 miles then there is no way the oil could turn to sludge and not drain out. Your engine would be seized up or have a major rod knock. What does the sludge look like?

I have attached another picture that shows how thick the sludge is. It comes out in globs.

135

I would check the head gasket, it might be bad, This is probably a good place to check as the 3800 are known to have bad head gaskets, This means that coolant is mixing with your oil causing the slug like oil, I would start with the head gasket and move on from there since most oil problems with slug involve head gasket problems

1 of 1 people found this helpful.
4,535

I sort of agree with the coolant in the oil theory except the sludge should really be a milky color, not black. It looks more like oil that has never been changed, but I'm assuming that is not the case. Is there anything else it may have been contaminated with? Is the car running OK otherwise?

91,415

That sludge looks like 200,000 miles with no oil changes. Did someone put several quarts of tar in your engine?

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,496 nationwide Grand Prix listings starting at $950.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,470
  • #2
    Tom Demyan
    Reputation
    3,110
  • #3
    munron
    Reputation
    2,550
View All

Related Models For Sale

Used Chevrolet Impala
545 Great Deals out of 33,465 listings starting at $1,981
Used Pontiac Bonneville
453 listings starting at $1,500
Used Chevrolet Monte Carlo
8 Great Deals out of 1,223 listings starting at $1,585
Used Chevrolet Malibu
1,084 Great Deals out of 58,106 listings starting at $995
Used Pontiac G6
42 Great Deals out of 3,875 listings starting at $1,700
Used Pontiac Grand Am
993 listings starting at $2,595
Used Pontiac GTO
9 Great Deals out of 426 listings starting at $4,995
Used Ford Mustang
437 Great Deals out of 41,575 listings starting at $1,488
Used Nissan Maxima
338 Great Deals out of 20,686 listings starting at $600
Used Chrysler 300
364 Great Deals out of 19,090 listings starting at $2,200

Used Cars For Sale

2005 Pontiac Grand Prix GTP For Sale
3 Great Deals out of 45 listings starting at $950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.