Quote:
Originally Posted by Purple Guy
but I don't care about the 617 turbo, since everyone knows that they are more prone to have problems; I was asking if a NA617 is more durable than a 616/615 or viceversa
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You have not yet defined the job you are looking to achieve. Your question is therefore impossible to answer. You asked which is the best hammer, a cobblers, framing or sledge. All will hammer, but some better than others depending on the job you need it for. Hammering is NOT a job, it is a function.
The OM61x are All fine engines, all are very durable if maintained and set to work in a job where they are efficient and not abused. All of these engines can be both utterly reliable or utterly horrific depending on what is asked of them. So until that is defined, there is no "right" answer.