What is the recommended rear diff oil wt for warmer climates? the 75W used in most cars here in CA seems to be more towards colder side of the spectrum based on manual.

Anyone here in CA using 85W?

Redline 75W90 Gear Oil GL-5

Red Line Synthetic Oil. 75W90 GL-5 Gear Oil (redlineoil.com)

Over here were it's colder .. even we use 80W90 GL-4 and in a hotter environment i think it's even better/more recommended to use a thicker oil..

Edited June 14, 20222 yr by dutchzcarguy