I use Amsoil too. In the motor and just refilled the differential with it. I'm happy with it, and will continue to use it.
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Kooks LT Headers/catback exhaust, E-force supercharger, JRE fuel line upgrade, JRE differential, 3.91 LPE gears, Roto-fab intake, JRE tune, DSS Carbon Fiber driveshaft, MGW shifter, Hotchkis chassis braces