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Hi, for the V70XC model, I determined that the differentials use 75W-90 GL5 gear oil lubricant. Surprisingly, the factory manual neglected to mention this. Does the differentials require any additive?
+1, but you do have the option of using synthetic gear oils that meet the GL5 spec. I used to own a Quattro which used GL4 in the manual transmission and GL5 in the differential - I refreshed both with Redline synthetic and was amazed on the difference it made on very cold days.