I was just wondering if it would be better to run an HD oil that has more detergents in it on the rinse phase to help removed more of the contaminents?
I use 10x30 Castrol non synthetic for cleaning and the rinse phase it worked great. I have continued to use no synthetic with 3oz of auto-Rx at each oil change as a maintenance program good luck.
I don't know if there is any advatage in using HD oil for the rinse phase but that is what I used when I rx-ed my car a few months ago. Using it gave me peace of mind.
My first clean cycle I had M1 5W30 EP. Then for the rinse I went Supertech 5W30 dino. For my second clean, I went Castrol tection extra for clean and rinse.