Fantastic! Thank you. I figured but I thought I'd ask. My 4R is my first Toyota and I want to make sure it lasts. It's got 115K on it and I'm fairly sure it hasn't been touch yet. Diffs and Tcase that is.
transfer case fluid
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Fantastic! Thank you. I figured but I thought I'd ask. My 4R is my first Toyota and I want to make sure it lasts. It's got 115K on it and I'm fairly sure it hasn't been touch yet. Diffs and Tcase that is.
Hmm, I have not touched my transfer case, and I get a nasty clunk if I switch in/out of low range when the vehicle is still cold. Even in relatively warm ambient conditions. :noidea:
While the oil analysis at the beginning looks impressive, it doesn't help me a lot without a similar analysis of other oil(s) for comparison.
Off to look for more discussion of 5th gen 4Runner xfr case oil...
Borg Warner patented the Morse type hy-vo chain. The Aisin Seiki VF2A in my TRD ORP is the same Aisin Seiki VF2A that was in my '97 Part-time SR5. They both use a Borg Warner patented Morse type hy-vo chain.
The spec for the Aisin Seiki VF2A in my '97, was for 75w90 gear oil. Since the design of the T-case hasn't changed at all, I could use 75w90 in my new TRD ORP.
In this specific application, the Toyota LF 75 gear oil is just to eek out a small reduction in drag due to the lighter viscosity over the old 75w90 spec.
The SR5 is a Part-Time Aisin Seiki T-case with electric shifting.
The 4Runner Limited has a Full-Time Aisin Seiki T-case.
The Tundra T-case is not the same as the T-cases in the 4Runner.
The spec for the Aisin Seiki VF2A in my '97, was for 75w90 gear oil. Since the design of the T-case hasn't changed at all, I could use 75w90 in my new TRD ORP.
In this specific application, the Toyota LF 75 gear oil is just to eek out a small reduction in drag due to the lighter viscosity over the old 75w90 spec.
The SR5 is a Part-Time Aisin Seiki T-case with electric shifting.
The 4Runner Limited has a Full-Time Aisin Seiki T-case.
The Tundra T-case is not the same as the T-cases in the 4Runner.
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1000MPH
Senior Member
Yeah, go to the Toyota parts website and look through the 10 or so dealers nearest you that do online ordering and you’ll see almost all don’t stock it and some that won’t order it.
0888581080 - Transfer gear oil lf - Genuine Toyota Part
Longo is one of the biggest Toyota dealerships in the US.
They’ve discontinued it...
Transfer Gear Oil Lf 08885-81080 | Longo Toyota Parts
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CutthroatSlam
Senior Member
How many miles do you have on your 4Runner?
CutthroatSlam
Senior Member
But the Toyota engineers must have spec’d the additives for a reason….thanks for giving us the reason.
2014 SR5 with 343K miles using Mobil Delvac Synthetic 75w90 in the transfer case and the truck spends most of its time in Montana.
CutthroatSlam
Senior Member
The greater issue is your admission that the transfer case and differentials haven’t been serviced yet after 115K. This is neglect and outweighs the impact of any additive package in the oil.
Seems to be some confusion regarding SAE J300 classification system. 75W is simply a monograde oil. 75W-90 is a multigrade oil.
At 40*C 75W and 75W-90 will have the same viscosity.
At 100*C, 75W-90 will have a higher viscosity than 75W.
So, with 75W-90 you will still have the same cold weather flow as 75W, but when you get up to operating temp or even higher under temps under high load conditions the 75W-90 will provide better protection.
Toyota most likely specs 75W for the small fuel economy improvement at the cost of gear and bearing life. However, 99% of customers will never fail their differential using 75W, so it’s a worthwhile trade off in their eyes (assuming regular maintenance).
If you are towing heavy a lot or some other severe duty application, 75W-90 is a much better choice than 75W.
At 40*C 75W and 75W-90 will have the same viscosity.
At 100*C, 75W-90 will have a higher viscosity than 75W.
So, with 75W-90 you will still have the same cold weather flow as 75W, but when you get up to operating temp or even higher under temps under high load conditions the 75W-90 will provide better protection.
Toyota most likely specs 75W for the small fuel economy improvement at the cost of gear and bearing life. However, 99% of customers will never fail their differential using 75W, so it’s a worthwhile trade off in their eyes (assuming regular maintenance).
If you are towing heavy a lot or some other severe duty application, 75W-90 is a much better choice than 75W.
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The 75w is only speced for the transfer case, not the rear axle or front diff.
The rear axle and front diff are speced currently for 75w85.
The lighter viscosity spec over past years in all three, IS all about trying to get a slight MPG improvement to improve Toyota's CAFE.
Personally, I'm using Redline 75w90 in all three.
You’re right! I’ve done front and rear diff and transfer case but clearly forgot while writing the response. Thanks for correcting me.
My point still stands regarding monograde and multigrade and why Toyota likely chose 75W for the transfer case. To your point it’s also likely why they chose 75W-85 for the diffs in place of the readily available 75W-90.
I used RP Max Gear 75W-90 for front and rear diffs and RP SynchroMax for the Transfer Case. So, they will probably all blow up because I didn’t use Toyota Oil.
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As I said in my post you quoted, a slight MPG improvement to help the CAFE numbers IS the reason.
At the time of the release of the 5th gen, Toyota even had some little tech bulletins they printed up, explaining the reason to dealer service personnel.
CutthroatSlam
Senior Member
There must be a reason....thanks for the reason. Now can all the OCD posts on this stuff be put to rest?
