I use on customers vehicles Penrite Pro Gear 75W90 and recommend driveline fluid changes at 50K.
*Dont forget when fitting the ARB cover that you mark the dip stick as per the instructions, as in transcribing the level plug across to the dip stick.
*As a guide you can work on a level at aprox bottom of axle housing.
*Also note how many litres you put in for next fluid change.
Regards
Daz
__________________
|