condonse
SDD Junior Member
My 2013 6.7 diesel calls for 10/30 as the first choice of oil that covers the largest range of temperatures. I usually use amsoil oil in my vehicles. They only make the oem blend of oil in 10/30 so I was wondering if it would make much difference to use the 15/40 that seems to be the most common diesel oil so I can use full synthetic? The 15/40 temperature starts at 20f, I live in VA where it does get in the teens and rarely gets into single digits. I would say I would probably use the truck in less than 20 degrees f maybe twice per year. I know this seems simple but I like full synthetic oil and it seems to me that the better oil I use can only benefit me in the long run.
Sonny
Sonny