Which one is better for a turbo DI engine pushing 20+ PSI? Why?
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Both are SN+, both are Dexos 1 G2, both are GF6A

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Mobil 1™ Extended Performance 0W-20 motor oil provides protection for up to 20,000 miles between oil changes – guaranteed.

Extended Protection Full Synthetic - Valvoline™ Global Operations
Modern engines pack a heavier punch, with technologies that boost fuel efficiency and power. But this greater performance creates extreme operating conditions that require extra protection. Valvoline Extended Protection Full Synthetic maximizes your vehicle’s longevity by providing the ultimate...
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Both are SN+, both are Dexos 1 G2, both are GF6A