J JCR New member Joined Jan 12, 2021 Messages 5 Reaction score 0 Points 1 Mar 14, 2021 #1 GM specs call for using 75W-85 gear oil in my truck.I have found some MOPAR 75w-85 and wondering does my GM vehicle need to add a friction modifier in the differential with the oil?
GM specs call for using 75W-85 gear oil in my truck.I have found some MOPAR 75w-85 and wondering does my GM vehicle need to add a friction modifier in the differential with the oil?
