JS- Formula Shell is supposed to have good cleaning abilities, heard it recommended w/ARX before. I would consider a hi-mi oil (Pennzoil HMV) with esters that will have it's own cleaning abilities derived from the esters and will be compatable with the ARX, which I believe is ester-based.
I am following the app instruction. I now know to stay away from ester rich oil. The question is, should I use high detergent oil? Any particular recommendation for low ester, high detergent oil? Thanks.