Differential oil

[afatouraee]

Hi guys
I was Wondering if its ok to use 80w90 gear oil instead of 75w90 recommended by gm. In this part of the world 75W90 is not readily available, so i was wondering if I can use the 80w90 instead .I would appreciate your comments.
Many thanks in advance.

 

[abearden]

Not a professional mechanic, but I don't think a 5W difference is going to cause that much of a difference; especially since it's much hotter there than most of the US so the thicker stuff should be fine.