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German Castrol 0w30 is the best for an LS1. hard to find, but the best, hands down. dont use M1 5w30, its too thin, almost a 20 weight. LS1s like a thicker 30 weight, and GC is on the thick end of a 30. second choice would be M1 0w40.
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yes, my hog is bigger then yours
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