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The info I have is that it is supposed to be 75W80 GL5 (as per the F4R 730 manual, N.T. 3286A). The problem I have is that I have found a 75W90 which is also GL5, but 75W85 which is GL4. Both are Nulon synthetic oil (Australian brand - where I am btw).
So which am I supposed to use?