Q: Is my car toast?

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well i have low compression in one cylinder,oil soaking some spark plugs,oil getting in my air cleaner filoter,and smoke that comes out my exhast when accelerating

My car has 146000 miles.
My car has an automatic transmission.

having low compression in one or more cylinders with oil fouling of plugs will indicate a bad piston or piston rings. If the engine is more expensive to replace then the prive to repair and is over the value of the car after repairs are done then the car repair is not economical to get done.

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