I have used that process on occasion, with mixed results. One oil-burner engine we tried to rescue after a botched rebuild by a different shop didn't work, but we found out later that one piston was missing an oil ring. Other times, the oil consumption got reduced pretty dramatically and we didn't have to open the engines up and redo the ring job. Even if the engine might need a rework later, the Bon Ami won't do any further damage.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!