At the company I currently work, I service all the trucks, I actually volunteered at our branch office, because Iam a oil freak and I thought it would be fun and save them money. The trucks were being badly neglected until I started doing it and it bothered me. Anyhow they(of course)like to go the cheapest possible route, and I ussually find closeout oil and purchase it to save them money, but when the recent stock ran out, I ended up going with Supertech 5w20(Our trucks are all Newer Fords) and I will say I was really impressed, we run the oil to 5000 miles and it seems to hold up as good as any and better than alot. One oil that was awful was Advance auto brand, the trucks all used oil like crazy, where they never did since or again after it was gone. Ill probably stay with the Supertech, it seems thick for a 5w20, but performance is as good as Valvoline, Castrol, Pennzoil or Quaker State, that I used, compared with appearence of the drained oil and performance of the gas milelage and engine sound, of the oil. Not exactly scientific but a observation.