2004 MERCURY GRAND MARQUES, LS 195,000 MILES

Asked by GuruDVBH7R Mar 26, 2025 at 09:01 PM about the 2004 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

2004 GM LS 195,000  miles approx.
I am experiencing black sludge in the front of the engine (see the attached
photo of a napkin and pictures). I have scrubbed the engine several times,
but the sludge returns after driving about 50 to 100 miles. A mechanic has
inspected everything thoroughly and cannot find any leaks after cleaning the
engine as well. Oil/transmission fluid/radiator/antifreeze plastic container: no
leaks and clean. Getting 3000 miles to a quart of oil. Initially,  No noises,
engine very quiet. Car runs well, no problems.

What would produce the black sludge substance?
PS. I used Gunk engine cleaner and Gunk shine spray several times.

2 Answers
311,425

Gene answered 2 weeks ago

No picture? Has a smoke test been done? Exhaust pressure test?

Mark helpful
158,595

James answered 2 weeks ago

I'm thinking air conditioner compressor oil or power steering fluid. Jim

Mark helpful

Your Answer:

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