What oils and filters do y'all use? Ive been using Napa Oil Filters with delo 400 15w 40, but i recently switched to Mobil 1300 15w 40, and my truck seems to run smoother longer on it, im curious as to what oils and filters evryone else uses, i do an oil change bout evry 1750-2000 miles. /forums/images/graemlins/whistling.gif /forums/images/graemlins/k5.gif