Engine oil & Diff Fluid
Hey everyone just bought a 89 325is, and I want to do some service to it, I'm a firm believer in Castrol motor oil, but what viscosity should I use for a motor that has a 130,000 miles on it? It has according to the vin# a 3.73LSD, what type of fluid do you recomend for the rear diff? & Synthetic or Reg. gear oil W/an additive? Any suggestions would be much appreciated.