Greddy just came out with a new line of oils, i'm sure its pretty expensive but if it is from a turbo company it can't be that bad right?

on the back of Import Tuner this month, may be a bit extreme, i don't know your setup, but otherwise i would think Royal Purple would be your best/most economical bet, i have heard alot about Motul, but never used it, probably higher price and harder to get hold of than royal purple