Castrol syntec is a conventional oil. The oil molecules have been hydro crack to give them a smaller and more evenly sized molecules. But it is not a true synthetic oil like the lable claims. Mobile took Castol to court for claiming their oil to be synthetic. Use what ever oil you like but dont pay more for something your not getting.
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Edward VanCura, Amsoil dealer. For information about amsoil synthetic oil and lubes leave me a message. Ask about preffered customer program and buy at dealer cost.
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