I first ran an Auto-RX (used M-1 SS for 1500 miles) 30,000 miles ago followed by 2 OCIs (full synthetics) with a maintaince dose. The next 3 OCIs were syn-blends with the recommends usage of LC. Currently using full synthetics again with LC. I think I should still have a pretty clean engine. Last UOA was very good. Should I Auto-RX again or not?