[Delighted_Jester]

Originally Posted by Defpo

Would this liqui moly hypoid gear oil gl4/5 75-90 be acceptable in both the front and rear diffs? Is there a difference between a G4 and GL4 oil?

https://www.fcpeuro.com/products/gea...BoCaGUQAvD_BwE

As for your G4 vs GL4 question- G4 is BMW name of their own fluid. GL4 is industry standards. As for the front diff, according to my G20 manual, BMW calls for axle oil G2 for all cars except E53 and E83 w/o N46. The rear axle is G4 for M sport differentials.