All gear oil, and nothing but gear oils. Gl4 and all

I will be swapping out all gear oils in my 2023 at 15k miles. Need some feedback.

Manual transmission. I want a gl4, and from what i see it's a redline world. No amsoil experiences? I do not want to use toyota fluid, not thrilled with it during the cold. Would redline hold up at 75k use?

Transfer case. I'm just going toyota here unless someone can convince me otherwise.

Front and rear diff I was going to use Mobil1 gl5, but tell me why not.

Thanks

 

Way too early, you're draining out good oil. I'd suggest waiting until at least 30,000 miles (this is for severe service). This money can go towards tires, running boards whatever, but fluids simply arent critical on Toyota trucks.

Redline for tcase and trans. Tried and true.

Any GL5 thats on sale for diffs. Mobil is a good choice.

 

Keep it simple.

Transmission- Amsoil is fine
Transfer Case - Toyota is fine
Differentials - Mobile 1 is fine

Happy Friday.