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I've done some research and I agree with that. Definitely avoid Royal Purple, I remember it doing very poorly on a couple particular tests. Here's a white paper that might be way TMI, but interesting:
AMSOIL Performance Testing Archives
Amsoil was the only one that did very well on every test.
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I can only hope the motor oil scores as high as the gear oil! I actually read through the entire 24 pages. I'm going to stick with Amsoil in mine.