How long are you going with the Amsoil?
Amsoil makes really great cycle oils, most that do run it I believe are going minimum 5K intervals. I like to change mine between 2500-3000 miles so I run Rotella 15W40, the syn 5W40, exxon superflo 20W50. I have Val synpower 20W50 in there as I got a case bogo, but if *I* had to chosse one oil to run from here on out, it would be Rotella 15W40 or another hdeo, mobil delvac, Chervon delo, castrol tection etc....