'16 Silverado diff fluid M1 vs. Redline

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Amsoil all the way, I have used both RL and Amsoil 75W110, though I like both, I prefer Amsoil.

In Tennessee you should put 75W110 Amsoil and leave it there for 100K miles.!!!
 
In all my decades of 4WD's the only one that made noise was shot from Shell quick lube - and had to be replaced at 60k (30k on oil that looked like water) - been using M1 the 12 years since then .... DIY since then ...
 
Certain additive chemistries do degrade over time as do engine oil and transmission fluids, which is another reason for changing.
 
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