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I have never used them. Only used manufacturer approved products. But I was working with much larger units where mistakes cost real money.
A lot of products are promoted by people with a vested interest. A lot of the perceived benefits are wishful thinking. If your engine produces a cloud of smoke after you add a product to the fuel is that pollution being cleared out of the motor or just what you added being burned? What is it doing to your expensive Cat Converter? Does the supplier give a cast iron guarantee that he will make good any damage caused?
To dislodge any buildup in the motor the additive would have to contain volatile aromatics to dissolve the build up or increase combustion or exhaust system and EGR system temperature. What is that going to do to your motor if there is any residue in the fuel when you are driving?
I think the question you really need to ask is "Why does the engine need this product" Using additives is just like putting a band aid on a broken leg. The band aid won't last long and you still have a broken leg.
Most injector problems are caused by fuel contamination. Do you always use reputable fuel or do you fill up at the servo that is always cheapest.
Do you use genuine fuel filters or after market?
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