Rislone engine treatment
From all that I've heard about oil treatments, they seem to do more harm than good. The general consensus is that if you change your oil on time, you shouldn't need any engine flushes (until you start getting "up there" (75K miles) for a while. Like the other guy said, modoern oils and modern engines don't generate as much "crud" as they used to.
keep it simple; keep it running.
XXL