IN cars, best quality in my experience is the 616 617 na. If well cared for you just about cannot wear them out.

In light trucks the cummins has to be the best, I think.

In other catagories I have no experience.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.