Redline, high molybdenum has proven to be great and combating dry starts that cause Hemi tick. Isn't for everyone because of cost, but I believe it or Motul is the best you can buy. Read the synthe3tic oil thread. IMO, both Penzoil's Ultra and platinum are great over the counter products as well, Amsoil SS too, all are top 5 in my book. All 5 have molybdenum in different quantities but Redline and Motul have the most by a lot, and they are also group 5 oil which is the only true synthetic oil. But, I might even start at the bottom of the top 5 say Penzoil Platinum and see how your truck likes it, and if you want the benefits of the other oils read up on them and try them later. But as long as I own this truck, he's drinking redline.