jsleesi,
Good topic. My thoughts are to use a cleaner that is not very harsh and gives some clean burning lubrication at the same time.The # 131 Schaeffers seems to fit this category best of the ones I have seen. The Lucas additive seems to burn reasonably clean but I do not know if it cleans? I think using the Lucas showed in a oil analysis I had run,it was harmless I was told,yet was still in the oil. Was never confirmed though and I did not follow up because I quit using it.I was using it as a upper cylinder lube during break-in of a new 02 motor.
Again,it seems if one has a clean system it would be best to use a less volatile maintanence type additive vs going 6 months then hitting the system with a harsh potentially destructive cleaner.
You know,we talk alot about Snake Oil engine oil additives, looks like some of these fuel additives should be avoided?