Ls gear oil in transfer case? (1 Viewer)

[DIRTBIKEUSA]

Might be a dumb question or a tired one at that but, the fluid specification for the AWD transfer case calls for 80w90. Can mobile one 75w-90 “Ls” be used in place of standard gear oil without causing engagement or dragging with the transfer case viscous clutch?

Thanks!

 

[jonheld]

From the website:
"Mobil 1 Syn gear Lube LS 75W-90 is intended for initial fill, topping-off or refilling differentials, final drives, transfer cases and other gear applications where lubricants meeting API Service GL-5 and multi-purpose or mild EP gear lubricants are recommended"

Personally, I use Amsoil products, but any old synthetic or analog gear oil will be fine. I use 75W90 for all 3.

 

[manofthewoods]

Might be a dumb question or a tired one at that but, the fluid specification for the AWD transfer case calls for 80w90. Can mobile one 75w-90 “Ls” be used in place of standard gear oil without causing engagement or dragging with the transfer case viscous clutch?

Thanks!

Long answer is in post 2 above.
Short answer: your center differential will love you.
Mechanical things have feelings too.

 

[DIRTBIKEUSA]

Thanks for the reply. I wanted to make sure the friction modifier in the fluid wouldn’t cause an issue.

 

[Mrtwooooo]

The viscous coupler is a sealed unit and the gear oil in the transfer case doesn't interfere with the insides of the viscous coupler.