What is your favorite 75w90 diff fluid that doesn't start with Ams...? I need to find a good one for the Subie.
Best Diff Fluid 75w90?
- Thread starter Cooper
- Start date
- Status
WiskyBadger
Site Donor 2025
I have some Masterpro syn 75w90 that I got on the Oreilly lots o loot promotion. Meh, so far so good.
Last edited by a moderator:
We've had good luck with Valvoline Full Synthetic 75-90 in the limited slip rear end of my father's '02 WRX.
How about the one that starts with Red?
Last edited:
can I ask why not ams***? pabs would give it to you at cost?
Because I don't want to have to pay for a membership to buy Amsoil. I have in the past.... Nothing against them, quality product.
Redline, duh
Originally Posted By: LotI
How about the one that starts with Red?
Yep, if I am having the diffy fluid replaced I am going to go
with Redline.
How about the one that starts with Red?
Yep, if I am having the diffy fluid replaced I am going to go
with Redline.
I think Redline is the most comparable to Amsoil. M1 and RP are other choices.
Motul Gear 300 has the bet VI i think; 222
http://www.motul.com/system/product_descriptions/technical_data_sheets/106/Gear 300 75W90_GB.pdf
Motul Gear 300 has the bet VI i think; 222
http://www.motul.com/system/product_descriptions/technical_data_sheets/106/Gear 300 75W90_GB.pdf
dnewton3
Staff member
There is no "best" diff fluid that any of us could suggest because we have zero ability to understand the unique application you're in. To really declare something "best", a very long series of trials and testing would need to be performed specific to your application, and as much as BITOGers love to push their favorite flavor onto others, the reality is that none of us have the time/money/resources to declare something "best" over the alternatives.
However ...
There are MANY very good diff fluids which will more than suffice for your application. I'm not directly familiar with your veh requirements, but as long as you use a properly spec'd fluid, you'll be fine.
There is a LONG list of fluids that meet the stringent gear oil standard listed here in the links of this post:
https://bobistheoilguy.com/forums/threads/gl-5-and-j2360.197713/
Follow both links and you'll understand the J2360 testing and then see the lubes that qualify.
http://www.pri-network.org/wp-content/uploads/2013/07/LRI-QPL-7-26-13-on-line.xls
I will also note that there are many conventional lubes that meet these same specs, so syns are not going to be "better", but they would most likely last "longer".
I now return you to our regularly scheduled brand-bias lube bigotry ...
However ...
There are MANY very good diff fluids which will more than suffice for your application. I'm not directly familiar with your veh requirements, but as long as you use a properly spec'd fluid, you'll be fine.
There is a LONG list of fluids that meet the stringent gear oil standard listed here in the links of this post:
https://bobistheoilguy.com/forums/threads/gl-5-and-j2360.197713/
Follow both links and you'll understand the J2360 testing and then see the lubes that qualify.
http://www.pri-network.org/wp-content/uploads/2013/07/LRI-QPL-7-26-13-on-line.xls
I will also note that there are many conventional lubes that meet these same specs, so syns are not going to be "better", but they would most likely last "longer".
I now return you to our regularly scheduled brand-bias lube bigotry ...
Last edited:
Originally Posted By: Cooper
What is your favorite 75w90 diff fluid that doesn't start with Ams...? I need to find a good one for the Subie.
GM do a very good on that has a factory part #9986290. I know that there are several reblends Shell, Chevron, etc it's way better on oxidation and low temperature than the previous product. If you want it but can't find it let me know. Look on GMDexron.com and you can find the list of approved reblends
What is your favorite 75w90 diff fluid that doesn't start with Ams...? I need to find a good one for the Subie.
GM do a very good on that has a factory part #9986290. I know that there are several reblends Shell, Chevron, etc it's way better on oxidation and low temperature than the previous product. If you want it but can't find it let me know. Look on GMDexron.com and you can find the list of approved reblends
Mobil Delvac
For available right away over the counter. That you can get from almost any part store . Hand down is Mobil 1
For online order . Amsoil
I preferd Mobil 1 since its good and I can get it any time I want .
For online order . Amsoil
I preferd Mobil 1 since its good and I can get it any time I want .
Mobil 1 or Redline, usually I use M1 because it's easier to find. Doing the Sport Trac's rear diff later today with M1 75w-140,
Originally Posted By: JohnnyO
Mobil 1 or Redline, usually I use M1 because it's easier to find. Doing the Sport Trac's rear diff later today with M1 75w-140,
100% agree
Mobil 1 or Redline, usually I use M1 because it's easier to find. Doing the Sport Trac's rear diff later today with M1 75w-140,
100% agree
Differential Gear Oils and Differentials themselves, are not a fluid/unit that I have ever had any issues with. I have used many store brand and name brand gear oils along with Mobil 1(75w90LS). All without any issues to speak of!
Redline on our Sube. Changed at 50,000 kms and looked the same as the day it went in. Mechanic flatly refused to believe it hadn't just been replaced.
- Status
Similar threads
