Just had the oil changed in my 600 Cummins.. Dodge dealer installed cummins filter but filled with 11 quarts of Valvoline 15-40... Ever hear of this used in Diesels Engines.. I have always used Rotella or Delo...

It is Valvoline Premium Blue. If I remember right, Cummins worked with Valvoline to develop this oil. It's supposed to be pretty good.

Premium Blue is what I will use,havent done an oil change yet,only got 2600 miles on it,but that is what I will use til 10000 miles,then I will switch to Amsoil.

Just had the oil changed in my 600 Cummins.. Dodge dealer installed cummins filter but filled with 11 quarts of Valvoline 15-40... Ever hear of this used in Diesels Engines.. I have always used Rotella or Delo... Valvoline Primium Blue is what Cummins puts in your new engine before it leaves the factory,I continue to use it,no problems,also stick to the Fleetguard filters,owned by Cummins,no warranty problems.