I use Rotella T 15W40 in my gasoline pick-up with no problems. And I use the 15W40 and 5W40 in my motorcylces that often see 10,000+ rpm pulls and steady 5000 and 6000rpm on the hwy. The HDMO's are SL rated for gas motors, and my truck and bikes seem to be doing just fine. These oils have all the good stuff in them because they are not trying to make the EPA happy.
Heck right on the back of the jug it says it's good for new and old diesel and gasoline powered vehicles. This includes personal vehicals and commercial vehicles such as off-road, truck rental, delivery, utility, and school bus fleets........exceeds API SL.