M90 is Volvo part number 31280771. Get from your dealer. The part number has changed over the years so adds to the confusion.
If your gearbox is working fine with nice smooth changes I wouldn't bother.
I used Millers Diff oil from Opie and I'm pretty certain it was 75-90 API GL-4 GL-5 but I'd need to dig out the bottle to find out. It's different oil if you have a locking diff
Cheers
Mark
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY
940 LPT Manual 1996
740 SE 1990
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