Switched from Motorcraft 15W-40 dino oil to Rotella T6 5W-40 Full Synthetic with 8oz of the Rev-X additive. My 6.0 never ran so good. Its expensive, but well worth it. And ALWAYS use Motorcraft filters for oil, fuel, and transmission.
A forum community dedicated to Ford F-series owners and enthusiasts with a Power Stroke diesel engine. Come join the discussion about performance, bulletproofing, modifications, classifieds, troubleshooting, maintenance, and more!