For a while I have run 75W90 Severe Gear in my 88 4Runner with Detroit TrueTracs in front and back. These are non-clutch limited slip diffs. I'm looking at freshening up the gear oil and am considering going with Amsoil's cheapest 80W90 synthetic lube to save some $$.
My question is, what is the added value from this cheaper grade to the Severe Gear grades? For low-HP, around-town and occasional moderate off-road use, is the more expensive product that much of an upgrade?
I still want to stick with Amsoil as I believe they do a great job with their drivetrain lubes. I run their MTF in my Hondas and MTG in the 4Runner and have always been more than happy with them.
My question is, what is the added value from this cheaper grade to the Severe Gear grades? For low-HP, around-town and occasional moderate off-road use, is the more expensive product that much of an upgrade?
I still want to stick with Amsoil as I believe they do a great job with their drivetrain lubes. I run their MTF in my Hondas and MTG in the 4Runner and have always been more than happy with them.