What's the best diff fluid for 3.76LSD? Read through many old threads!

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03-16-10, 10:34 AM

#16

Alexus_300

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Quote:

Originally Posted by Rock-a-Lex

I thought no matter what you have to stick to 75w-90 diff fluid? What do these numbers actually mean? and is this a good weight for NY weather? (ranging from -5 to 100 degrees depending on the season)

75w-90 is a pretty universal weight for gear oil on almost all diffs that sees daily use. But the different weights are for people who use their cars for different purposes. The first number in the gear oil means the pouring consistency that it has when cold. The last number is the oil consistency when it is at full operating temperature.

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03-16-10, 02:56 PM

#17

sakataj

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Quote:

Originally Posted by Alexus_300

From the factory, supra's require 80w-140 but it's hard to find it so amsoil is the closest thing. But on the stock non-lsd diff on 95% of GS out there, just go with the 75w-90 and you're set.

thanks

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03-17-10, 01:35 AM

#18

sam430

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hears an additive from amsoil for chatter issue with lsd:
http://www.amsoil.com/StoreFront/ada.aspx

What is currently in my stock diff:
Amsoil 75w-110

What will be in my LSD differtial:
Amsoil 75w-110
http://www.amsoil.com/StoreFront/svt.aspx

if you really want 74w-140
http://www.amsoil.com/StoreFront/svo.aspx

DIY changing Differential Fluid.
https://www.clublexus.com/forums/per...ial-oil-2.html

Last edited by sam430; 03-17-10 at 01:58 AM.

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03-17-10, 06:28 AM

#19

Rock-a-Lex

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My MAIN goal is to have the BEST protection diff fluid with the lightest weight (still suitable for my location's climate range) that would have the least power drag (or inefficiency).

I don't want to have a molasses thick diff fluid that would create even worse gas mileage than I am already getting and rob me of power.

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03-17-10, 08:49 AM

#20

ChrisK

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Quote:

Originally Posted by Alexus_300

From the factory, supra's require 80w-140

No, it does not. The factory Torsen LSD requires API GL-5 SAE 80W-90 (or SAE 90). Only TRD LSD (clutch type) requires 80W-140 with friction modifiers, but it did not come installed from the factory.

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03-17-10, 10:27 AM

#21

sam430

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Quote:

Originally Posted by Rock-a-Lex

Definitely go with the 90...but the 110 offer extra protection with good fuel efficiency. I don't think you'll go wrong with 90 as others are using that too in the diif w/LSD.

http://www.amsoil.com/StoreFront/svg.aspx

go amsoil

Last edited by sam430; 03-17-10 at 10:32 AM.

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03-17-10, 11:23 AM

#22

Alexus_300

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Quote:

Originally Posted by ChrisK

No, it does not. The factory Torsen LSD requires API GL-5 SAE 80W-90 (or SAE 90). Only TRD LSD (clutch type) requires 80W-140 with friction modifiers, but it did not come installed from the factory.

Believe what you will but I've always been told by Curt Aigner that the stock factory diff uses 80w-140 and have found that it works best for all racing application that I've put it to. You also know that the higher operating range is good for track use since the oil won't break down right?

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03-17-10, 11:48 AM

#23

ChrisK

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Quote:

Originally Posted by Alexus_300

Believe what you will but I've always been told by Curt Aigner that the stock factory diff uses 80w-140

So, how will you explain these?
click here
click here
or
Straight from Toyota Repair Manual

Last edited by ChrisK; 03-17-10 at 11:54 AM.

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03-17-10, 03:33 PM

#24

Alexus_300

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Quote:

Originally Posted by ChrisK

So, how will you explain these?
click here
click here
or
Straight from Toyota Repair Manual

Like I've said in the previous post, toyota recomends a 90w non synthetic oil which is much much thicker than a pure synthetic such as amsoil. I'm not here to debate who's right and wrong. I'm just stating the facts from all the years of tracking and friends who have done so. If you ever get a chance and compare an non synthetic 90w oil to a 80w-140, you'll see the difference in how much easier it is to pour the pure synthetic oil.

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