Hey everyone, I'm going to be replacing the fluid in my front and rear differentials this weekend, and it says to use 75W-90 Synthetic Axle Lubricant in the manual, use either the GM stuff or a 75W-90 Synthetic Axle Lubricant that "meets GM Specification 9986115."
I was looking at the AMSOIL Severe Gear 75W-90:
http://www.amsoil.com/storefront/svg.aspx
However I'm not sure if it meets GM specs 9986115.
Has anyone else had this issue? Are there any other fluids from other brands I could use? Any input would be great, thanks!