The FAQ on the Valvoline site now says it takes
4 OR MORE CONSECUTIVE oil changes to clean your engine 100% which I take to be marketing speak for "Use Valvoline Restore and Protect and never stop if you want a clean engine".
I think we should stop taking Valvolines reference to 4 OCIs so literally.
Their messaging has changed, just like they originally said they were concerned about clogging filters if Valvoline Restore and Protect did too good a job too fast. Now they say deposits removed by Valvoline Restore and Protect are dissolved and stay suspended in the oil and do NOT affect the filter like. (Also in the FAQ)
FAQ is at
https://www.valvolineglobal.com/en/restore-and-protect/ - scroll to the bottom of the page