I had a 02 Acura TL, had to get rid of it because tranny keeps going out on it. It started consuming 1/2 qt every 2000 miles at around 90k.
Mixed quart of Rislone during OC & noticed oil went dark before even hit 2000 miles, so I performed another OC but this time using MMO instead, after having read on this forum that MMO is stronger than Rislone. But w/ Rislone my oil was black soup after 2k.
IMO Rislone did a fine job at removing the sludge/carbon build-up because oil did not get dark until almost 3000 miles later w/ MMO in it.
Nevertheless, oil consumption stopped after two OC using both Rislone & MMO.
I run Royal Purple in my car now & OCI is 8K. RP is dark purple straight out of the bottle therefore hard to detect sludge/carbon build-up by appearance. As a safety measure, I routinely ADD half quart (16oz) of MMO to my engine oil at 6K mark, drive another 2K before performing OC.
IMO what you're doing now is a simple way to remove any sludge/carbon build-up. Although you don't have to drain it at 1000 mile mark, it would be wise to monitor oil condition closely.
If oil turns dark after just 1K, drain & start over ASAP. If oil does not turn dark quickly, let MMO do its work for at least 2K before OC..