- Joined
- Sep 23, 2017
- Messages
- 433
hey guys! im confused about the gear oil in my truck. its supposed to be 75w90 but GM says that we are NOT supposed to use LS additives/Friction Modifiers. I have seen that some oils already have those additives inside. Is that ok If i use that? I will NOT be adding any extra additives, im just gonna drain and fill. Local availability in canada here has Amsoil and Royal Purple so im gonna go with one of the two. Do i need to buy the GM fluid that apparently doesnt have those additives or can I just drain and fill with amsoil or royal purple
thanks
thanks