I am running a Caltex Havoline 5w-40, and it still hasn't quitend down my lifters.... So im going to try mobil 1, might get a better response out of it...
Terry.m: I recommend Shell Fully Synthetic Diff oil.... awesome shit and it will quiten the diff down (did for me). It costs $24.95 a litre, but you only change the oil in the diff every 50,000kms or so.... So I think its well worth it.