Originally Posted by 390pi
Why is 5w40 Rotella okay for the Cummins 6.7 w/ DPF in the Ram 2500/3500/4500?
15w40 was approved prior to 2019.
Are heavy duty DPFs less susceptible to perm damage from non low-SAPS oil than the light duty DPFs?
Depends on DPF design. That is commercial engine. It is DPF design and emissions they have to meet. Are you sure that engine and those vehicles are in the same emissions schedule as GC? I really do not know, but I suspect it has to do something with design of DPF and emission standards. Same goes for big rigs.
Why is 5w40 Rotella okay for the Cummins 6.7 w/ DPF in the Ram 2500/3500/4500?
15w40 was approved prior to 2019.
Are heavy duty DPFs less susceptible to perm damage from non low-SAPS oil than the light duty DPFs?
Depends on DPF design. That is commercial engine. It is DPF design and emissions they have to meet. Are you sure that engine and those vehicles are in the same emissions schedule as GC? I really do not know, but I suspect it has to do something with design of DPF and emission standards. Same goes for big rigs.