Blow by is a perfectly normal condition. It happens, every mile you drive your engine the blow by increases. I'm sure every Mercedes diesel on this forum has at least a small amount of blow by when the engines hot. Hell, even my engine with only 121k on it has some blow by, and its the fastest mb diesel Ive driven. Dont worry about blow by gasses. If it starts up easy on the coldest of morning dont worry about it

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1981 300SD 512k OM603