I changed my oil to 0w-30 Mobil 1 fully synthetic.. They say the only difference between 0w and 5w is the weight and that the 0w gives better gas mileage.. It's lighter so your pistons move up and down with less restriction...
I got Mobil 1 0w-30 and the Mobil 1 filter and OMG!!! I felt the difference from the start.. changing gears and accelerating feels soo much better!!!!!!
wow.. the power of synthetic oil.. soothes the soul..