My 1997 SL500 looks like it might need a valve job. I've been hearing tapping noises for a while now, and used Techron to try to fix it, but instead, the car lost a cylinder and the check engine light came on. The exhaust smelled like burnt oil. When I went home, all the spark plugs had normal fouling, but one was all gray (including the ceramic nose). I turned the car on with the plug out, and the sound from the engine was like somebody was smacking the engine block with a wrench.

Does anyone know if this is a valve job? How much am I looking at?

Also, what would this car be worth if I try to sell it for parts? I live in Marin County, California.

Thank you in advance,
John

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