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Amsoil Gear Lube

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12. We didn't want to leave out the lube! This Amsoil extreme-pressure Severe Gear 75W-90 is perfect for cheapskates who don't want to change differential oil more than once a year. The fully synthetic formula features proprietary additives that form an iron-sulfide barrier coating on gear surfaces, providing the ultimate line of defense against wear, pitting, and scoring.