Rear differential

[SouthJ1]

Thank you Ldub your always the first to answer me

[Ldub]

Knowing my way around the search function, & where the knowledge base is, comes in right handy...

[89Vette]

Tho the link above (by LDub) only shows the lighter, standard weight oil, I noticed the 2001 owner's manual lists 85W-140 as an alternative for warm climates.

If it never/rarely gets below freezing, feel free to go with the heavier stuff. Joe Isuzu (dealership) told me not to run the heavier stuff but you can't argue with the manual (engineers).