[cashflyer]

I finally received a reply back from the Amsoil people and wanted to post it here as a follow-up.

Harvey,

The Swepco 201 is just a regular petroleum gear lube with limited slip additives that meets both API GL-5 and MT-1. AMSOIL SVG 75W-90 also meets API GL-5 and MT-1 and contains limited slip additives. Both of them should work fine in your transmission. There are misconceptions lurking in the public such as the one that says don’t use a synthetic lubricant in some applications. The difference in petroleum and synthetic base oils are that synthetic will withstand more heat and resist oxidation longer than petroleum and synthetic will shift better in cold temperatures. Additives are what protect the gears, I’ll elaborate on that by saying to meet GL-5 it’s the sulfur phos additive that protects the extreme pressure (EP) caused by the sliding action of hypoid gears. AMSOIL puts an extra treat of EP additive in the SVG gear lube and should provide benefit beyond what is called for in your application.



Sincerely,

Kevin Dinwiddie
STLE/CLS
Technical Product Manager
Drivetrain and Power Transmissions
AMSOIL INC