Use 5w20 Mobile 1 fully synthetic. I always check for coupons on autozone or O-reilly's websites. I changed my oil about 2 weeks ago, and got my oil really cheap. I printed off the autozone coupon for $10 off a 5 quart jug of Mobile 1 synthetic oil, and took that coupon to Walmart where they sell oil the cheapest. Got a jug for 16.50. I almost bought enough oil for the next three years. lol Can't beat that!!!