i have heard a lot of people talking about synthetics the past couple years an i thought the synthetics where really helping to reduce wear in the motors ? i also thought well if i put on a bypass filter to keep oil cleaner it should help with wear ? i am looking to do 10,000 mile or less oil changes . i am just trying to get the life out out of this 6.0 that i am getting out of my 95 7.3 that has 400,000 on it an is still going no major motor work ever. the amsoil i ordered is the SAE 15w40 heavy duty diesel and marine motor oil