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I'd buy whatever oil has the highest API grade (the most current is SM, if I remember correctly). And once you start building up your motor, I'd run full synthetic. But if it's stock, synthetic vs. conventional vs. partial synthetic won't make much of a difference.
Diesel oils (API 'C' grade) have more detergents and zinc. So you could run diesel oil every few oil changes and keep your engine really clean.
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