Mobil 75w-90 Synthetic. I'd need to check my records to confirm, but pretty sure I've got 100k+ miles on the Mobil without issues, but I don't tow or do any significant offroading (occasional beach driving and farm roads...some concrete curb hopping when needed).
FWIW, the normal service schedule suggests that Toyota considers the gear oil to be "lifetime"...not that I really believe in lifetime fluids, but gear oil would probably be one of the products closest to achieving it, IMO. I've been intending to change mine again, but like a lot of things on an 18 year old rig, it's easy to put off until another day since it still works and isn't really hurting anything...![]()
Mobil 1 in the differentials and Toyota OEM WS in the tranny
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I second thisThis is the way
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T-Case I used Mobil-1 at whatever weight was called for. Front and Rear I used Chevron Delos because its full synth and cheap.
Transmission I used Maxlife back when it was available from Wal Mart. I could get it 20$/gallon instead of 25+/qt. If you have a Toyota dealership locally that prices WS reasonably its worth getting the real stuff. However, around here dealers charge an arm, leg, and first born for everything.... So Maxlife it is.
Is it ok to mix different differential oils? I had my front and rear differential fluids changed at a Toyota shop about 2 years ago. I have to replace my two front axles and therefore will loose some diff fluid in the process. I have some Mobil1 Synthetic and Valvoline Synthetic 75-90 fluid. I don't know what is in the diff but is it ok to top it off with synthetic (ie. mixing different fluid types)?
T-Case I used Mobil-1 at whatever weight was called for. Front and Rear I used Chevron Delos because its full synth and cheap.
Transmission I used Maxlife back when it was available from Wal Mart. I could get it 20$/gallon instead of 25+/qt. If you have a Toyota dealership locally that prices WS reasonably its worth getting the real stuff. However, around here dealers charge an arm, leg, and first born for everything.... So Maxlife it is.