Does anyone know what fluid to use in the transfer case? I'll soon be due for the 75,000 mile change and don't want to go to the dealer. The owners manual lists a Shell TF0753. The only thing I found that remotely resembled that name was on a Shell Australia website that listed a Shell TF automatic transmission fluid. Likewise, for the front and rear differentials the owners manual says to use SAF XO in the front and SAF XJ in the rear. The Australian website for Castrol says that SAF XO = 75w90 GL5 gear oil and SAF XJ = 75w140 GL5, both synthetic. Is it OK to use any synthetic gear oil that meets that spec or is something else going on here? I'm in the US.