In checking out Amsoil's recommended lubricants for 1998 4Runner, front differentials are listed w/ Adrd and w/o Adrd. Owner's Manual also indicates there are two types. What's the difference, and how can I tell which one I've got?
Differential, Front W/ Adrd.....GL-5
75W-90
Severe Gear 75W-90
SAE 75W-90 Synthetic Gear Lube
Differential, Front W/o Adrd.....GL-5
Below -18
Differential, Front W/ Adrd.....GL-5
75W-90
Severe Gear 75W-90
SAE 75W-90 Synthetic Gear Lube
Differential, Front W/o Adrd.....GL-5
Below -18
