I'm going to use Neo. It was recommended to me by an Audi rally-car afficianado. He said:
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The first thing I would do though is make sure you use the best oil you can. One of the Toyota teams was having problems with blowing out the rear diffs in their cars. They tried Redline, but they would only last one or two events. They switched to NEO, and the problems stopped.
I use NEO 75-90 in the rear diff, and RHD in the gearbox. No signs of wear at all.