Also beware that many users, including me, saw no difference under the valve cover after the ARx prescription, and noticed no change. I guess it depends on the condition of the engine, and many variables. In my case it was used on two different high mileage Honda engines. I've spent my $90 BITOG induced indulgence on ARx, read my BITOG readings, and now believe that these engines are not getting better than they already are (and were) with today's conventional engine oils. Next time I feel a BITOG indulgence urge it'd best be given to the BITOG board itself.
As Gary Allan, one of my favorite members, would write: YMMV