I think what you're missing is that ash doesn't have anything to do with regens. Regens remove soot. The ash remains. Eventually it builds up to the point of causing obstruction and requires either a cleaning or replacement of the DPF. What I'm saying is that this oil has little to do with regen frequency but a lot to do with service life of the DPF. DPF is good for over 100k miles and often much longer. But... replacement is a few thousand dollars. That's the impact and what is being addressed by this oil, as I understand it.Originally Posted by dnewton3If I am understanding correctly, the differences are thus: - SA is an issue in that the residuals can attack the susceptible elements in the cat converter, primarily. But the new low=SAPs lube of discussion in this thread clearly talks to regen issues as well. Additionally with very low (zero?) Ca and Mg and such, there's a very low base number; issues with acids and some bearings, as stated above. (All the more reason to have sealed crankcases and make sure you don't short trip the drive cycles). - Soot is an issue in that higher concentrations cause more frequent regen cycles, as well as eventually may (will?) require cleaning or replacement of the DPF? And there's some evidence that FBCs can alter this concern in a positive manner. As a summary, do I have all that right?