2010 FX4 | Amsoil SVO | 75W-140 | 79,689 miles

[CarbonSteel]

Gang,

Below is a link to the third UOA on my FX4's rear axle. The only thing that stands out for me is that I could have gone longer with the OCI. I decided to change it because the oil was really dark when I pulled the sample, but as you can see, it was fine. The VOA for SVO has a TAN of 3.1 and this was 4.3, so I could have probably gone to 6.5 or so on the TAN before changing. SVO was re-installed and I will sample at 80K, but not change it unless the UOA at that point indicates otherwise.

Blackstone's comments below:

This sample looks pretty good. It's the best yet for this differential, and that's great, especially since this is the longest oil run to-date. We're seeing some nice, low readings at iron, nickel, and titanium, and no moisture or excessive solids turned up. The TAN read 4.3, which is fine. A longer interval should be okay for next time, but a sample at about 80,000 miles wouldn't hurt, just to make sure things are staying steady. Seems fine from here!

Enjoy!

All 2010 FX4 UOAs

 

[Pontual]

If you reinstaaalled it, are you sure it was kept clean during the removal nd replace process? Have you cleaned the diff case and rinsed/dryed it before draining it?

 

[donnyj08]

Excellent UOA. I would expect nothing less from severe gear. Probably the best gear lube money can buy.

 

[CarbonSteel]

Originally Posted By: Pontual
If you reinstaaalled it, are you sure it was kept clean during the removal nd replace process? Have you cleaned the diff case and rinsed/dryed it before draining it?
I have a Mag-Hytec cover that has a drain plug so that is not a problem, but I should have said that I changed the oil and replaced with new SVO to make it clearer.

 

[aquariuscsm]

Originally Posted By: donnyj08
Excellent UOA. I would expect nothing less from severe gear. Probably the best gear lube money can buy.


^^That's what I'm thinking too.

 

[Pontual]

Alright.

 

[Greasymechtech]

Amsoil gear oil, with your driving style, is a 100k fluid... especially with maghytec cover

 

[ltslimjim]

Nice results!

Always appreciate your well-presented data!

 

[CarbonSteel]

Originally Posted By: Greasymechtech
Amsoil gear oil, with your driving style, is a 100k fluid... especially with maghytec cover
Likely; but with the towing that I do I wanted to be sure of that. I will still test at 80K on this run and will extend from there.

 

[MolaKule]

So you have about 25,000 miles on this run of SVO?

Still a good showing as this lube is cleaning out (dispersing) the
gunk from the factory fill.

Differentials are the most neglected component for most owners.

I think by monitoring and replacement you're maintaining a healthy diffy.

 

[CarbonSteel]

Originally Posted By: MolaKule
So you have about 25,000 miles on this run of SVO? Still a good showing as this lube is cleaning out (dispersing) the gunk from the factory fill. Differentials are the most neglected component for most owners. I think by monitoring and replacement you're maintaining a healthy diffy.
No; it is 79,689 miles on this run (149,289 total miles on the truck). This the third OC. I agree, most times the differential is "out of sight and out of mind" in a literal way. IMHO Amsoil makes the best gear oil, although I do wonder how M1 would perform.

 

[CT8]

Looking wonderful!

 

[dnewton3]

Originally Posted By: 2010_FX4
Originally Posted By: MolaKule
So you have about 25,000 miles on this run of SVO? Still a good showing as this lube is cleaning out (dispersing) the gunk from the factory fill. Differentials are the most neglected component for most owners. I think by monitoring and replacement you're maintaining a healthy diffy.
No; it is 79,689 miles on this run (149,289 total miles on the truck). This the third OC. I agree, most times the differential is "out of sight and out of mind" in a literal way. IMHO Amsoil makes the best gear oil, although I do wonder how M1 would perform.



1) excellent UOA. I think you'll find 100k miles is a no-brainer, and could probably go further.

2) as much as folks tend to be anal about the engine OCIs, many end up neglecting the diffs, p/s and xfer cases often ... a phenomenon I cannot explain. This is not your m.o., but it does plague others.

3) you've finally got that truck broke in at 150k! Now you can hammer on it a bit harder. You'll probably wear it out in another 500k