Not to rain on your parade but I tend to think common sense will say that the motor has been replaced or rebuilt at some point. Either that or whomever put the bulk of the mileage onto it, ran it on the highway exclusively and did frequent oil changes. Even that would be a maybe for me, at 315k.

My 300d just turned over 100k and it has a little smoke out the filler.

My first 300sd (w116) had about 80-100k on it after an extensive rebuild, when I purchased it, and it smoked a little bit.

I did buy a parts car at one time from Boston that had around 300k miles on it and had exceptionally little blowby for the mileage, but it still had evident blowby.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22