I just ordered Amsoil gear oil

[Navi]

No issues I guess, just 75W140 is double the viscosity of 75W85. It's going to be overkill especially in the winter. But if the OP tows, I guess it will be better.
https://www.amsoilcontent.com/ams/lit/g2043.pdf (2nd page)

75W85
Kinematic viscosity at 100°C: 13.3 cSt (SAE40 viscosity)
Kinematic viscosity at 40°C: 76.9 cSt

75W140
Kinematic viscosity at 100°C: 25.9 cSt (SAE60 viscosity)
Kinematic viscosity at 40°C: 172.1 cSt

There were very severe issues in the 2022 and 2023 Ford light truck differentials. Differentials were going out under 30000 miles. No one can be sure if these problems have been fixed. Even if they were fixed I feel more comfortable using this thicker gear oil. 75w140 has become popular in the F150 owners community.

Even Redline has zeroed in on this issue stating their 75w140 is popular with F150 owners. However after doing my research I believe Amsoil is the better product here.

Ive learned the hard way that when it comes to Fords light truck line you want to go thicker and it seems thats the case too with GM light trucks as well.

 

[Navi]

I did make a mistake here in ordering the Amsoil. I think @Pablo has some links to order Amsoil so he gets the proper credit. I truly think Amsoil is a great product and I might look more into it in the future. Right now Im on 5W40 Euro oils but willing to consider Amsoils lineup of products.

 

[Pablo]

I did make a mistake here in ordering the Amsoil. I think @Pablo has some links to order Amsoil so he gets the proper credit. I truly think Amsoil is a great product and I might look more into it in the future. Right now Im on 5W40 Euro oils but willing to consider Amsoils lineup of products.

Thanks - if there isn't a product link in a thread, please use the link in my signature.

 

[Pablo]

Amsoil gear oils: https://www.amsoil.com/c/gear-oil/25/?zo=515729

 

[Glenda W.]

Arrived as promised!

 

[The Critic]

Im almost at 15000 miles and thats my thoughts exactly!

What happened with the prior vehicle was I started hearing loud grinding noises at 25000 miles. Took it to the dealer thinking this would take 1 week under warranty and I was wrong. It was 4 weeks and complaints lodged with Ford.

So on this next go round all gear fluids...front diff, rear diff and transfer case getting changed out before 15000. Research done and most think the best long term reliability is with the 75w140 variety. I understand 75w85 is just for the auto makers mandated mpg requirements but not durability.

No amount of boutique lubricants would have prevented this failure. This was clearly a defect, either in the design or in the manufacturing of your unit.

Using this experience to justify the usage of boutique lubricants is misguided at best.