The general consensus is that Redline MT-90 is the best oil for the R series transmissions.
Off-topic, WD-40 can help get grease/oil out of clothes, but the WD-40 will then need to be washed out. WD-40 is actually a de-greaser, not a lubricant (though it can act as one), so it will destroy the oil and help loosen its bonds in the fiber of fabrics. Dish soap designed for grease will also help get oil out of clothes (just don't put it into the washer, hand wash it only or you'll have a hellofa mess).
Anyway, that was my Martha fucking Stewart moment for today.