Everyone has an opinion on this. I would read your manual, use the weight for your temperature encountered and use any name brand oil with the API rating SN. Do not waste your money on additives. Change your oil as recommended for your driving style. I have had my oil examined at a lab several times after running for 5000 miles, 6 months and was told I could go longer. Changing oil at 3k and 3 months I feel is a waste of money.