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synthetic has higher resistence to viscosity breakdown . which means two things . Longer oil life and less likely to break down under stress and high heat . Synthetic oil is your friend. IMHO MObil 1 here. Used to use Amsoil(the best) but its hard to get . Not a lot of stores carry it and you have to seek out the dealers. Its also pretty expensive . Mobil 1 is a close second IMHO and well worth it especially when I can get it at Costco for 3.66 per quart
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