Severe Gear vs Redline 75W110

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How do these two compare (for rear differential use). I've never used Redline in the rear diff or know anyone who has. Looking through the gear oil UOA's,Severe Gear is about as good as it gets,but have always been curious about Redline. Seems both brands have a kind've cult following.

My apologies in advance if this has been covered before,I searched here and didn't find the info I was looking for.
 
Heard somebody ask, once, how often differentials experience failure and/or excessive wear due to inadequate gear lube properties. Short of leaks, low oil level and water contamination I have not heard of too many...
 
They are both excellent gear lubes, and 75W110 makes the most sense for Trucks and SUV's.

I always recommend draining the oil at 5-10,000 miles and then thereafter at 30-50k intervals to ensure sufficient additive coverage.
 
Originally Posted By: MolaKule
I always recommend draining the oil at 5-10,000 miles and then thereafter at 30-50k intervals to ensure sufficient additive coverage.
This is great advice and is what I did with my FX4 (13,300 for first OCI). Have a look at the iron levels in the first OC/mileage versus the later ones (with 4 to 6x the mileage):

Code:
Date: June | 2015 Jul | 2012 Feb | 2011

Oil Brand: Amsoil Motorcraft Motorcraft

Type: SVO Synthetic Axle Oil Synthetic Axle Oil

Oil Viscosity: 75W-140 75W-140 75W-140

API Service: GL-5 GL-5 GL-5

Lab: Blackstone Blackstone Blackstone



Truck Mileage: 149,289 69,600 13,300

Oil Mileage: 79,689 56,300 13,300



Make-Up Oil: 0 0 0



Aluminum: 1 1 1

Chromium 1 1 2

Iron: 120 148 429


PS...I highly recommend Amsoil Gear Oil (but have nothing against Redline--just never used it).
 
The sulphur level of Redline (2.4%) is a typical level for GL-5 oils. But phosphorus level ( 0.3% ) is very high...
Can it be dangerous for seals, copper parts of gear boxes and so on?
 
Ran Amsoil 75W110 in TC and differential for 100K miles as in their product specs and it came out slightly dark. It very well could have been a fill for life but then being on BITOG made me drain it and try something else. Presently running RL 75W110 in TC and differential for over 50K miles and its as good as the Amsoil.

Amsoil would be my choice.
 
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