Been using Valvoline 140w for over 30 years. The rear end has over 350,000 miles on it. Used GM posi additive last time---Ended up using 2 packs of additive.
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64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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