Using 75w-90 Instead of 80w-90?

[TeryT]

The manual says to use 80w-90 in the differentials, but I want to use PAO synthetic and can only find it in 75w-90 by Mobile 1 locally. Any issue using the slightly different spec synthetic gear oil?

We live in Phoenix, and I don't think the lower W (winter) number being different by 5 could make that much difference.

 

[toyoboy]

you ll be fine.

 

[hre814]

what temp is 80w-90 good down to?

 

[02SE]

I've used the Mobil 1 synthetic 75W90 gear oil in the transmission, transfer case, rear axle, and front diff. for 7 years, no problems at all.