Amsoil Severe Gear Iron Sulfide

Joined
Dec 21, 2023
Messages
128
Location
Michigan
One thing I’ve not been able to find any information about is the Amsoil Severe Gear forming an iron sulfide layer on parts. Does anyone have any additional information on this? I currently use Amsoil Severe Gear as I know it’s a great gear oil, but I’m curious to learn more about iron sulfide if anyone has any information about it.
 

The extreme pressure (EP) additives form Ferrous Sulphite and Ferrous Phosphate films at the contact surfaces.
 
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