1990 Mercedes-Benz 420SEL Q&A
1990 Mercedes-Benz 420SEL Question: the cost to fix oil leaking from the pistons.
You description is not clear enough. If you mean your engine is burning oil to the point where it is fouling the spark plugs and making the engine run rough and stall then the piston rings are worn, the cylinder bores are damaged or the pistons are damaged. In any case the engine needs to be disassembled and inspected and or replaced with a rebuilt engine. - patrick mannion