I use the Quaker State 4x4 blend. 10w30 year-round. Also, my truck has used basic Fram filters since 20,000 miles, and it's still running clean and strong with 160,000. Doesn't burn an ounce of oil between oil changes. I don't know what everyone's big problem with Fram filters is (yes, I did read that link posted a while ago regarding filter comparisons). I say go with what's worked for you.