Newsflash: that engine sucked. The top ends on most (vergasser) MB's seldome last mroe than 150K miles but the bottom ends seem to never die. 65K is a little early and sounds like too infrequent oil changes.
Sadly that's true, but it's not endemic to just MB. Any contemporary German car out of warrenty is too scary to consider - the shadetree mechanic has somewhat less of a fightiung chance these days which is putting it mildly.
You get what you pay for.