I used RP in my b16, and rb26 with no ill effects afaik. I didn't get my oil analyzed, and changed it excessively frequently though... Most of the oilguys say it's not so hot, but it was reasonably priced, and it easily available in the weights i wanted to run.
edit: that being said, i'll probably be using the oem oil for now until napa has another 3.49/qt sale :P
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