I just broke 60K the other day on my Taco , looking to do the Motor and F/R diffs . Motor Oil is going to be Royal Purple for sure since its already been bought , but I cant find any solid reviews on why RP is "bad". I used to always run RP in my Nissan SR20 motors and it worked great.
So between RP 75-90 and Mobil 1 75-90 gear oils , Which and why? Its between these two primarily because they are in stock at the local Autozone or Walmart.