I been scouring an interweb and it would appear that the opinions towards this type of engine cleaning range from 'fantastic - for a month' to utter contempt at selling snake oil to gullible motorists.
An Audi user on another forum had it done to his S4 and was impressed by the slight increase in efficiency and smoothness, but a month later he posted that the MPG figures were back to what they were before the clean.
Others have said that carbon is pretty hard to shift at the best of times and they can't quite understand how this fuel mixture manages to shift deposits where manual cleaning and chemicals fail. Another factor which I had thought of was that the engine is now used to running with tolerances that take into account any build-up. Clean that away and your exposing the engine to uncoated surfaces that just *may* have been protected by a slight build up of carbon.
A guy with a Jag had 2 injectors fail after the clean and surmised that it was the carbon build-up that was actually holding the things together and keeping them working.
Also someone questioned the point at which the mixture is added and how much of the engine it actually reaches before it's vaporised and burnt off; and also does the muck now flowing through the exhaust system do any damage?
A phrase which was came up time and again on numerous forums was the best clean out method would be to give your car an Italian tune-up. You can guess what that involves.
All things considered I think I'll save my money for something important like petrol.
|