I’ve been thinking of changing my diff oil as it is just approaching 30,000 miles since the ratio was changed. 2011 4/4 so assume BTR. I see Rimmer are selling Castrol SAF-XO Final Drive Lubricant which GoMog say is correct. Can anyone confirm as garage just say sae90. Also anyone got a picture of the rear of the diff showing drain & fill points as on mine they are not immediately apparent.