I've always run mine longer than the "recommended". I've used LC-20 to do some of the heavy lifting with the previous OFL so as to be able to use fresh oil/filter for both cycles of ARX. (And all vehicles thus far have been under 100,000 miles and show no oil use between changes, etc.) Fuel Power is always used.
All other services are done (all fluids/filters changed, alignment/tire pressures perfected; normal maintenance performed, etc) beforehand so that any "changes" are notable. Happily, none have been noted (meaning, the used car/truck bought is in excellent shape); I've wanted the ARX use to be the final touch. Only afterwards am I interested in beginning oil analysis.