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if you have an LS1, DO NOT USE M1 5w30. its the worst oil ever made. do a quick search on ls1tech, and youll see hard evidence. M1 is all marketing, and nothing else. there have been regular dino oils that have out performed M1. M1 has been shown to break down after barely 1000 miles through oil analysis.
you cant go wrong with german castrol. autozone is the only place the carries it. go to your local store and ask them to order some, they usually do. if not, WS6store sells it by the case. royal purple and amsoil are also good.
if you insist on using M1 5w30, i have about 8-10 qts. that i will give to you free of charge.....thats what i think of using M1.
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yes, my hog is bigger then yours
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