I am changing the front diff, rear diff and transfer case in my 03 Tacoma 4x4 TRD (electronic locker). Planning on putting the Amsoil 75w90 Severe Gear in all 3. I used the same lube in the rear diff for my 01 Tacoma and it worked well. Thanks for any input. Any opinions on how long I can leave the Amsoil in before a change, it has 37K now.
Amsoil Severe Gear 75w90 for Tacoma
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What viscosity does your owners manual tell you to use in your front diff, transfer case and rear diff. My 2000 Tundra calls for 75W90 GL5 in the front and transfer case, and SAE 90 GL5 in the rear (unless temps drop below 0degF, then 80W90 may be used). Just curious if your manual is as specific on viscosities. Thanks.
A synthetic 75w-90 can safely replace 80wt/90wt or 80w-90 grades. In many cases, it can also be used in place of an 85w-140 mineral gear lube in differentials. This results in much lower temps and improvements of 2%-3% in fuel efficiency.
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Apparently Toyota doesn't think it is the same thing, or they wouldn't have been so specific on their requirements. It would have been very easy for them to state "use 75W90 GL5 all the way around because it's all good". I personally like to use SAE 90 GL5 when it's called for. My experience with used oil analysis shows viscosity SUS@210F values around 90 for straight 90 weight and in the 50's for RL 75W90 GL5. Is that the same protection at higher temps? I don't think so. You can expect your diff temp to be 100degF higher than ambient road temps. Will your rear diff blow up if you use a multi-vis GL5? Probably not. Is SAE 90 GL5 readily available? No. I've found Lubrication Engineer's LE 607 to be a good one though. If you do a search on this web site, you will find out more info on it. Good luck with your choice!
Thanks INDYMAC, the rear end specs really have me confused. I don't see straight SAE 90's readily available. It does seem interesting that they allow a GL5 75w90 in transfer and front diff but want a straight SAE 90 in rear. Unfortunately I don't see any used oil analysis for 75w90 gear lubes. Anyone else have some advice on this one.....I don't want to have warranty problems but seems like there must be a better gear oil than SAE 90. I know lots of taco owners are running the 75w90 in rear...and I did it in my 01 taco for 30K and it felt great.
And now for the real world - In both my Tundra and Sequoia, I changed the driveline components to 75W90 at 1000 miles and then change every 50K. Both vehicles with over 100K miles, with no leaks, no noise and smooth engagement. Use the 75W90 Amsoil with confidence.
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