Just contemplating changing the differential oil in my '70s 4/4.
Looking at various options for the desired Castrol 75W-90 I have previoulsy used and most of them now appear to be synthetic.
Is this now the default option for the older Salisbury axle, or should I search for an older EP type diff oil?
Cheers.
( I did search the forum before posting this, but found nothing conclusive).
Last edited by clubsport; 14/01/20 11:19 AM.
