Another diff/transfer fluid question

I am getting ready to do my 30K service on my 2020 SR5 TRD. Dealer said gear oil is backordered so I started doing some research. I am looking to use the Ravenol Diff/Transfer kit, but see there are 2 different products, DGL 75W-85 and MTF-FE 75W-85 GL5 (one green and one gold). Question, is one preferable over the other? Both Synthetic. Thanks!

 

No reason to do your transfer case at 30k in my opinion. Certainly not called for in the Toyota maintenance schedule.

For the diffs I used Amsoil Severe Gear but any quality 75-90 will be fine.

 

I’ve checked with 3 dealers and they all use 75-90 in rear, differential. They only use 75 or 75-85 if it is a warranty claim.

 

The green one is a more affordable option. It’s like $20 less than the gold ravenol for the kit. I just ordered my kit yesterday and spent the extra $20 for ravenol.

 

I'm going to assume the Ravenol MTF-FE was either a typo and you meant MTF-1, as I'm not seeing MTF-FE on Ravenol's website, or you were looking at Eurol MTF-FE. The MTF-1 is not GL5 rated whereas the MTF-FE and DGL 75W-85 are. A GL5 rated gear oil comes with more extreme pressure additives than a GL4 or non-GL5 rated oil. GL5's are typically recommended for hypoid gears like in axles/differentials. Blauparts sells maintenance kits for tundras, 4runners, etc; they appear to use the MTF-FE GL5 fluid for the tundra diffs, and an MTF 75w (not listed as GL5) for the transferase. For the Sequoia, they use the same MTF-FE GL5 for the diffs, but a Fultrasyn 75w90 (again, not GL5).

Comparing the Eurol MTF-FE 75w85 GL5 and DGL 75w85 GL5, the kinematic viscosity is lower on the DGL, meaning the DGL is actually thinner, which is surprising to me since the -FE is "fuel efficient" designed for that fraction of a percent of fuel economy.

Ravenol DGL specs

Eurol MTF-FE specs