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1. What kind of vehicle you have: 09 Altima 2.5S 2. What your owner's manual says -- not just viscosity, but certifications (look for acronyms like API SM, ILSAC GF-4, etc.) and change intervals as well: API - SAE 5w-30 - change interval: 3750 3. Where you live: Dallas, TX 4. How you drive...