Frank still hasn't approved my application to the Auto-RX forum, so I still can't ask there, but I did find a bottle of the original Auto-RX while cleaning up my garage. 500 mile wash cycle with conventional oil. Then back to normal OCIs. No rinse cycle. This must be something Frank suggested semi-privately (i.e. in this forum, but not in the official instructions). The bottle did say to reuse every 10,000 miles.