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    Amsoil Severe Gear 75-90 vs Factory Fill

    Hello, Like the title states I had the factory fill GM grape scented oil made by Blue ester 75-90 in my 01 Firebird. Rear was quiet but started to get a rubbing sound at the right rear, the right axle bearing and axle wore. Axle was replaced with a Dorman axle kit and Valvoline 80-90 Durablend...
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