just speaking from experience. I've had to have the injectors replaced in my 4-runner as a direct result of using a fuel injector cleaner purchased from a national chain.
The engine has recently been rebuilt along with the injectors being replaced by someone I trust. The truck was running perfectly. I went on a cross country trip and got a couple tanks of what I will call bad gas. The trucks performance suffered instantly after each fill-up and specifically after the last fill up in po-dunk no-where . Being 3000+ miles from home I went to an auto parts store purchased several bottles of fuel injector cleaner and with each proceeding fill up of 20+ gallons I would dump a bottle in as per the instructions on the back of the bottle. When I got back home and took the truck back to "a mechanic" I trust I was informed that the injectors needed to be replaced.
I do agree with you that mechanics by there very nature are in business and that business is to make money. This particular mechanic who is a family friend has gone out of his way to point me away from useless repairs or repairs he felt were un-necessary. I usually get a couple of opinions when I experience trouble and my friends is usually the last one I seek and more times than not I find that I have been lied to by other mechanics just looking to make a quick buck.
Sound advice is a matter of perception. I am merely relaying a past experience I experienced choose to ignore it if you like. Perhaps you have had a positive experience with fuel injector cleaners and the product works for you. I couldn't be happier for you.
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