I changed all 4 transmission oils on my 2004 awd v70R about 2 yrs ago. 4 different oil's. Most are once in a ownership so used genuine volvo got good dealer discount. If your dealer won't play ball try the Swansea lads who give forum members discount.
Bevel gear : SAE75W-90 API GL5
part no. 31259380.
Rear different : SAE80W API GL5
part no. 1161620.
Cheers
Bob.
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