shell Rotella T triple protection 15w-40 vs..........

Unless it's advertised as having a significant amount of zinc, do some extra research. Most oils, including diesel recommended oils, have had their zinc content reduced. Diesels have been using catalytic converters for many years now and zinc isn't compatible with them....around 2007, I believe.

http://www.amsoil.com/techservicesbulletin/MotorOil/TSB MO-2007-08-08 Flat Tappet.pdf