TRANSFER CASE OILS

Hey, fairly new here to the site, but have used it for help in various things. Ive had trouble with figuring out what transfer case oil to buy for my truck! Ive found a post that I think will help many out and made an account to post it on here for others, enjoy.


https://www.blauparts.com/blog/toyota-tundra-transfer-case-fluid-types-specs.html

 

I like wallys full synth 75-140 on all diffs...

 

I'm a valvoline guy 75-149

 

07-13 Quality 75w90 synthetic

14-21 Quality straight 75weight, or, alternatively, 75w90 synthetic. My dealership (low bar, I know...) uses 75w90 in transfer cases, even t cases still in warranty.

No need for anything heavier.

EDIT - Just saw that your truck was 2003 and not 2008... Disregard the above..

 

Does 1st gen call for GL-4 oil in the T-case?


GL-5 is for differentials… it has more sulphur that can corrode “yellow metals” I.e. brass synchronizers in a T-case. This is why GL-4 is spec’ed for transfer cases.

Viscosity is less of an issue. Lower viscosity in newer models is mainly to meet CAFE standards and enabled by better quality synthetic oils than were available 20+ years ago.

 

You are correct

 

I like the Mobile oils personally,

And, I'M a big fan fan of running Mobile 75-145 in all my Freightliner Cascadia diffy's , and change them every 100K miles, every 9 months.

My tanker drivers twist frames on trucks, so it's Mob.il for me