Yeah, I'll second that opinion. I've got two M112 powered MB's and they both purr. My 203 just turned 100K and the Mrs. 210 has 75K. We've had them both for a few years and other than regular maintenance the only thing they've needed were valve cover gaskets and CKP sensors. Stick with premium fuel and use Techron once or twice a year and you're good to go.

Other than that, the only thing to keep a close eye on would be the oil pressure test fitting. Replace the rubber gasket at the first sign of leakage. The part is only a few bucks and it's simple to change.