I guess I stirred the pot. I still stand by my statements. New rings, hone cylinder, replace piston. Now if there is severe wear and the piston clearance is to much then that is a differant matter. I am not suggesting to just put any piston in, but he should measure to be sure they are within proper tolerance. As long as tolerances are correct there is no "what if" assuming new rings and honing/glaze breaking. He could get away with not honing, but i would not. that can bring a bit of uncertainty to it. Honing helps the rings seat properly.

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1977 240D turbo