If you're going for just straight hard core durability and longevity it would be hard to beat the OM601....but at 72HP it will get you there just not quickly. They are a bit easier to work on than their OM61x relatives but also generally need less ongoing servicing. Mine had 335k+ on it when I sold it running fine, I had replaced the lifters (all 8), injector nozzles (4) and timing chain + vac pump. Could run it at 100% for hours on end and it would happily do it. Car maxxed out around 85-88mph depending on conditions

I'd still rather have an OM617 Turbo however, so much more power, and the sound is awesome....even if it does need more upkeep.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)