Honestly I know most people on here think that the OM648 is a longer lasting engine but the electronics are not. For longevity I would go with the M272. You really can't beat it for cost of maintenance and fuel. They are bullet proof engines! OM648 Have issues its really not a reliable diesel engine anymore when it has more electronics than a gas engine. I do love a good OM648 though
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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it