Rear diff fluid change

Thanks!

Based on that, my choice of M1 seems quite justified based on performance and price.

 

I wouldn’t hesitate to do 50k diff fluid changes. It looked way to good at 20k with hardly any metal shavings. Besides, we all have our friends that have never changed the fluid with 150k miles.

 

Anywhere between 30k-50k miles is a good number for me too.

It all depends on how often you sink your diff in creeks and tow too.

 

I work with a mechanic that owns a mid 2000’s 4Runner with 200,000 miles on it. Never serviced the diffs, t case or auto trans. Runs perfect. I’m not suggesting that’s a good idea, but sometimes we do over maintain our vehicles. I plan on servicing my diffs at 50k, however, I’m a big believer that people should service their vehicles when they feel comfortable. It’s their money. Their truck. JMO.

 

I think the Valvoline Synthetic 75w90 has a very slight edge on Mobil1, the 20 hour shear test the Valvoline stays within an acceptable viscosity while the Mobil1 is out of the range.either oil you can get locally at any auto parts or department store

 

http://www.widman.biz/uploads/Transaxle_oil.pdf I'll leave this right here #2

 

SAE 75W like Ravenol meets it, thought the manual said GL4.

I'm aware of a lot of people putting in 75W90 GL5 in the Tcase, even reports of the dealer service depts putting it in the tcase like both diffs. I'm sure because it's upwards of $60+ per quart. The ravenol is $17 and synthetic.

Whichever the case, there's been quite a lot of tcases failing and nobody knows why.

 

This is interesting news - any references? 3rd gens or 2nd gens? I'm curious, because anecdotally, I've seen the same about dealers filling the t-case with

$29 75w-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75w-90.

OA

 

Thanks a lot of info there.

"for example, Toyota specifies in their owner’s manual, theirSAE 75W without defining the rest of it. Oil sales people will sell you 75W90, but what Toyota is really asking for is 75W85 without sulfur/phosphorous. From the comments I receive, a standard SAE 75W90 GL4 does cause hard shifting and grinding in these Toyotas in 70ºF weather."

And it goes further into the difference between transmissions and differentials. I remember my friend put in 75W90 Mobil 1 gear oil in his Tacoma manual transmissions because some mechanic said it was ok. We debated it and I said you should change it out to specific MTL fluid, he said it shifted fine, no reason to. Well 25k later he was rebuilding his trans and syncros.

 

Here's a 3rd gen 2018 and there's more if you search, I've read a few.

https://www.tacomaworld.com/threads/2018-or-transfer-case-replacement.538709/

Also, check out this post #26

https://www.tacomaworld.com/threads/is-there-a-better-transfer-case-oil-than-oem.470568/page-2

 

I think it maybe because Borg Warner started making the transfer cases at some point for Toyota and thiers specs the 75W?, this is the case for Tundras starting in 2014

 

Mine is on the way (Amazon).

No worries though. I have full confidence in any lube that is in the meat of that paper. Good stuff.

 

Think I'll be changing out my differentials with RedLine 75W85 Gear Oil and the TCase with the Ravenol MTF-3 SAE 75W. Most likely around the 5k mark.

 

I did the Redline 75w85 on my truck twice but I seem to get a small amount of fine residue on my drain plug magnet, Im looking into light weight 75w90 gl5 oil that may offer a little better protection but I know I will lose a little bit on the MPGs(maybe), the Valvoline Syn power 75w90 gl5 is on the thinner side of the 75w90 spectrum even when it shears down through heavy use it still will retain a safe acceptable viscosity, im not quite sure if the thin Redline 75w85 through heavy use wont shear down to even a thinner unsafe viscosity although I have yet to find a UOA on it to prove that.

 

I used redline heavy shockproof in my 600hp Eclipse GSX transfer case and rear diff, and have a bunch left over. Would it be an adequate diff fluid for a taco?

 

I wouldn’t, the 75W250 would be a concern.

“Description: Red Line heavy ShockProof gear oil is a unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent. It provides a unique solid dispersion, which cushions gear teeth to help prevent tooth breakage and allows for the use of lower viscosities. The viscosity characteristics allow the lubricant to resist throw-off and provide a film thickness similar to a 75W250 grade, while providing the same low fluid friction as an SAE 75W90. This gear oil is recommended for heavily loaded racing differentials and transmissions, off-road racing, and problem gearboxes.”

 

Got a case of Amsoil 75W90 and will change diff fluids at 5k. Service intervals are really dependent on individual use. Operating in "extreme conditions" for example. We regularly haul a slide-in camper cross country for extended periods.

 

good choice for your application, from what I see doing my 30k OCI on my truck just a D Driver and light duty hauler the 75w85 rec'd by Toyota is at the barely acceptable range for protection, I never did a UOA or claim to be an oil Engineer but I know what im seeing on my drain plug as far as residue two times using Redline 75w85 gl5, I never seen anything hardly at all when I used Mobil1 75w90 on my GEN1.

 

Got an online discount from Pep Boys awhile ago and picked up in store. $8.79 before tax for Mobil 1 synthetic

$29 75w-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75w-90. Also believe Advance Auto Parts is running 20% off as well online. Not sure about in store pickup.

 

I've read this before and thought: what a great bit of info. Then, see on front page that it was performed by amsoil.
affadavits of procedure aside, it wasn't performed by an independent lab so, there is always the concern of bias. but, some data is better than no data I guess.