Maybe ask the guy who you think is a good Mercedes mechanic. Those compression #'s could be high IMHO because of carbon buildup on the piston tops. This can be verified by removing prechambers (which I must admit it, is probably the only way to really know) and of course the glow plugs. A good Mercedes mechanic can do this easily, check that all glow plugs are good, check for any cracks, warps or plugging of prechambers, see and maybe treat carbon buildup with something (I don't know about that except that there are products out there) All this is still way less effort and expense - most compression problems are too low and removing buildup if its there might cause the numbers to come into balance more. Good luck
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