I am wondering what the "Rislone in used oil" analysis would tell you. If there are lots of metals and contaminants in the oil with Rislone, would that indicate that Risone caused the problem, or simply cleaned them from the engine? If there are no metals or contaminants, would you conclude that Rislone did not clean them out, or that there were none there to start with?
Is there any kind of practical comparative test we could do between Rislone and Auto Rx (using OA or any other approach)? I may be willing to do this if anyone has a practical suggestion.