I had the stock belt (gates if I remember right) on my cummins diesel
and got about 60K miles on it before it snapped after shredding significantly. I now have a gatorback on there and now have just over 176000 mles without any incident whatsoever. I guess that's inda unscientific but it shows the quality and strength of their product line. I think they even have one higher up that's got kevlar or aramid fibers in it that's stronger yet. If you have the bigger than 100 amp alternator use it.