[rdass623]

having worked on cars on and off for 30+ years, I have found some of these additives are helpful. there are cases of carbon build up and fuel injector clogging (prior to full blockage) which will be helped by using these things. if there is a mechanical problem or no problem at all these will not help. everyone here is always changing water pumps and ims bearings, but there are no performance advantages to changing these before they fail, the car still runs the same. the same is true with these cleaners, if the engine is not dirty, they will do nothing. some like to call these products snake oil, but if you need to lubricate a snake, it might be just what you need.....