In addition to Rotella, I also use Mobil Delvac 15W40 and Valvoline 15W40 in my trucks...whichever is on sale. Come to think of it, I have also used Quakerstate and Pennzoil 15W40. All else being equal, though, I like Rotella, too. In my personal opinion, you can't go wrong with a name brand oil.