Joined
·
3,940 Posts
Either one will just fine. Both are excellent oils. I have been running M1 since the first oil change but I bounce between that and Castrol Edge Extended Protection, which ever the local auto parts store is running the sale on.
My trany, transfer case and diffs have Amsoil in them. 136K miles and still running like new.
My trany, transfer case and diffs have Amsoil in them. 136K miles and still running like new.