75-90 ok?

[Dexter10]

Have a 15 Sierra half ton and looking to do front and rear differential fluid change. Manual says 80-90 front and 75-90 rear full synthetics.

 

Wife's 06 Yukon dealer said use 75-90 full synthetic front and rear due to living in Maine and the cold temps. This was against manual listing for front as it too said 80-90.

 

Should I go 75-90 full synthetic front/rear on my Sierra for same principal or go 80-90 In the front like manual states?

 

Thanks

[O_J_Simpson]

go 80-90 front and 75-90 rear full synthetics

[Dexter10]

Thanks OJ.

 

I just noticed it says 75-85 FS for the rear.

[Colossus]

75-90 full syn is just fine for both.

[sdeeter19555]

75-90 full syn is just fine for both.

Agree...

 

75w85 is for fuel mileage, and they likely used 80w90 because it's cheaper.

 

Sent from my SM-T350 using Tapatalk

[txab]

75-90 full syn is just fine for both.

 

+1 No need for two different viscosities

[Dexter10]

Thanks guys

 

Called my dealer today and talked with the parts guy about what they stock for fluids. He told me they buy bulk 75-90 and that is all they use in the shop for our trucks. That's interesting.