Shell Rotella is one of the best for diesels, including turbo which mine is. At Walmart, Rotella T4 15W-40 is generally about $15/gal, and Rotella T6 5W-40 Full Synthetic is about $25/gal. When we did heavy trailering I used T6, which also made for easy winter starts. Today no more trailering so I can use T4 if I’m feeling cheap, but winter starts will “rattle your teeth out” for the first few minutes! What oil are you using for your F150 that is so expensive?