But Patman, this is assuming wear occurs from the oil NOT flowing or not flowing well. I don't think this is the overall problem. We've seen lubrication problems from having "too thin" of a film thickness. This will cause wear. I think as long as you're above an oil's "pumpability limit" you will be safe from "the oil's not pumping adequately". Remember...thinner oil...faster is squeezes out of where it's supposed to lubricate. That's why WD-40 doesn't work in an engine.