I've seen the ribbed, wider, flat belts go 100k, have sections of the rib missing and still not break, some of the tensioners are spring loaded, and it's a whole lot easier to replace a serpentine with a 3/8 power bar versus replacing and adjusting 3 belts, or even 1 belt not considering access.
It also is great when you can bring all the accessories closer to the front of the engine for service and you just need to get it fed right and let the tenison off the tensioner (or add it income cases) and you're done.
Use a larger alternator and electric power steering for no power steering pump.
regards
mech
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