For routine maintenance, like the current commercial that states "Use it with every oil change", I agree with evelrod - the primary benefit of additives is to the additive manufacturer's profit margin. However, when there is a problem, like when the son-in-law bought cheap gas or the vehicle has sat idle for a long time and some deposits have formed, they are a cheap cure. I have used Chevron Techron on numerous occasions and the owner has seen an improvement in all but one case. I know that two foreign upscale car manufacturers don't even try to hide this or private label it, they just sell you Techron if you ask for fuel system cleaner. But again, use it as the first step to solve a problem, not as preventative maintenance, and if the first treatment doesn't work, break out the tools and find the mechanical problem, a second can won't work any better!
