I just ordered Amsoil gear oil

N

Navi

Joined
Aug 14, 2019
Messages
843
Location
NYC
Im not a big fan of expensive premium oils but as a result of a prior vehicle with front differential problems I decided to go a different course. Ultimately it took a month for the dealer to rebuild it and it was a nightmare. When it comes to gear oil usually Im fine when it comes to whats on the Walmart shelf, but this time after going through a horrendous experience Im now willing to go down a different road.

I looked at all the different data on here, on the web and the Amsoil website. I came to the conclusion Amsoil would be a great bet if not the best bet.

The application calls for 75W85 but instead opted for 75W140. If anything goes wrong here its truly not the oil but the machine itself.

The funny part about this all is somehow all the gear oil people know about these matters when it comes to F150 trucks, Expeditions and Navigators. After my experience I have no problem spending a little more to get the best thats out there.

Thank you Pablo!
 
Was the OEM gear oil ever changed out? Anyways, I use Amsoil gear lubes too. You might want to change it out a bit early just to drain out the break-in particles, and I would’ve probably used the 75w110 instead of the 75w140…🥴
 
Dutchy491 said:
Was the OEM gear oil ever changed out? Anyways, I use Amsoil gear lubes too. You might want to change it out a bit early just to drain out the break-in particles, and I would’ve probably used the 75w110 instead of the 75w140…🥴
Click to expand...
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.
 
Navi said:
Im not a big fan of expensive premium oils but as a result of a prior vehicle with front differential problems I decided to go a different course. Ultimately it took a month for the dealer to rebuild it and it was a nightmare. When it comes to gear oil usually Im fine when it comes to whats on the Walmart shelf, but this time after going through a horrendous experience Im now willing to go down a different road.

I looked at all the different data on here, on the web and the Amsoil website. I came to the conclusion Amsoil would be a great bet if not the best bet.

The application calls for 75W85 but instead opted for 75W140. If anything goes wrong here its truly not the oil but the machine itself.

The funny part about this all is somehow all the gear oil people know about these matters when it comes to F150 trucks, Expeditions and Navigators. After my experience I have no problem spending a little more to get the best thats out there.

Thank you Pablo!
Click to expand...
How did you order?

What vehicle are we talking about? F-150? I would maybe have recommended 75W-110, but your choice.
 
Navi said:
Im not a big fan of expensive premium oils but as a result of a prior vehicle with front differential problems I decided to go a different course. Ultimately it took a month for the dealer to rebuild it and it was a nightmare. When it comes to gear oil usually Im fine when it comes to whats on the Walmart shelf, but this time after going through a horrendous experience Im now willing to go down a different road.

I looked at all the different data on here, on the web and the Amsoil website. I came to the conclusion Amsoil would be a great bet if not the best bet.

The application calls for 75W85 but instead opted for 75W140. If anything goes wrong here its truly not the oil but the machine itself.

The funny part about this all is somehow all the gear oil people know about these matters when it comes to F150 trucks, Expeditions and Navigators. After my experience I have no problem spending a little more to get the best thats out there.

Thank you Pablo!
Click to expand...
Amsoil makes very good gear oil. It's really not too much more than your other big brand synthetics. I'm curious what the failure and cause of failure was? You don't hear too many stories of front differentials going bad on normal use 4x4 trucks.
 
  • Like
Reactions: D60
Johnny248 said:
Amsoil makes very good gear oil. It's really not too much more than your other big brand synthetics. I'm curious what the failure and cause of failure was? You don't hear too many stories of front differentials going bad on normal use 4x4 trucks.
Click to expand...
In the 2022 to 2023 model year Ford had a bad bunch of gears. This was around that time of shortages, manpower and supply chain issues. In one case the differentials were failing as the cars were being loaded onto a car carrier.

Another issue is that when the truck is in 2 wheel drive there is still some power going to the front axles/differential. The Ford Tech demonstrated this on Youtube while on a lift. The axles were still being powered so the gear oil is still being worn down.

I dont know all the exacting details but I do know what it was like to be without my truck for a month. So this type of change I call it paranoia maintenance. Im sure Ford fixed this issue but I feel better using a higher quality thicker oil than what came with the truck.
 
Navi said:
When it comes to gear oil usually Im fine when it comes to whats on the Walmart shelf, but this time after going through a horrendous experience Im now willing to go down a different road.
Click to expand...

What oil brand and viscosity were you using in that diff until now and what is the mileage on the truck?
How often the diff oil was changed?
 
I've changed the 8.8 IFS diff oil in my F150s every 30K miles, but each time the old fluid looks brand new. Have 190K on one and 176K on the other, have always used 75-90 ST or Valvoline and never had a problem.
 
My 2012 4x4 F150 owners manual said 75w-90 front, and 75w-90 rear. But it said to use 75w-140 if towing. I went with Severe Gear 75w-110 front, and 75w-140 rear.

My daughter has an Expedition that said 90wt rear, but if towing use140wt. They tow big, I have not yet, but will do some. I would rather err on the side of protection vs protecting fuel economy. I mean it is a truck..........

The front diff gears on the 4x4 are turning, but no load whatsoever with the hubs disengaged.
 
Last edited:
Navi said:
Why would you say 75W-110? Did others have issues with 75W-140?
Click to expand...

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
 
Last edited:
You must log in or register to reply here.

Similar threads

M
HPL trans fluid and gear oil
Replies
11
Views
489
gasman556
Z
Subaru BRZ rear diff with LSD; what fluid?
Replies
8
Views
673
zeroptzero
A
Mazda Hypoid Gear Oil SG1 75w-85
Replies
7
Views
736
D1dad
C
I just ordered my Pirelli Scorpion AS PLUS 3
2
Replies
29
Views
1K
MKZman
D
Towing and gear selection
Replies
12
Views
482
BrendanC
Back
Top Bottom