Any 350SD, 350SDL, 300SD produced in '92 or '93, and S350 MBs are trouble waiting to happen. Correct me if I am wrong but MB tried to increase displacement by honing out the cylinders which, in turn, weakened the cylinder walls. The pistons, doing what they do ie: moving up and down, eventually would cause an "eliptical" cylinder which caused the piston to wear more and more of the wall away leading to increased oil consumption (as much as 1qt. per 100 miles as some people have reported). Also, beefier pistons and weaker connecting rods led to many punched holes in the side of blocks. MB does not say this is a design flaw for obvious reasons - however, they have been known to fix some engines per "good will". Do a search on the 350 diesels on the diesel forum and you will get TONS of info about this. I hope no one is rude enough to tell you, "this subject has been discussed to death" as I was once told.