This will be my 3rd time doing this service on my 2008 T4R SR5 4x4. Every time i do this service I’m showing minimal fluid wear on my front diff, transfer case, and especially rear diff. For those wondering I am using Valvoline full-synthetic 75w-90 because it is cost effective and replaced my fluid every 30k.

I have been using my car for 100% normal drives and 0% for towing or off roading.

I have researched on the forums and had little to no luck.

My goal is to not be cheap and at the same time not waste money on changing gear oil too early.

For fully synthetic gear oils, what service mileage interval have you guys been comfortable with...35k? 40k? 45k?

And what gear oil did you use?

I’m thinking about using walmart brand super tech full synthetic for my next service since its made by Warren Oil.

Please share your experience, thank you!