There is a whole range of retailed additives like all that you mention James. Our products are generally trade only, some can be obtained like anything, on the internet, but there is ÂŁ4 postage and you don't get to meet the trader. I add the product, as a preventative just to keep the exhaust areas clean, but there is often a benefit in doing that and that is an increase in performance because the vehicle breathes better. I'm happiest when it does nothing at all as I just want all to be clean, especially with diesel engines. It is a good genuine product John, that does a good job, but it won't turn a V6 into a V8, if you know what I mean. It will just make sure that post combustion areas are clean. Hopefully that will help stave off any DPF/EGR/Turbo issues and that is the best benefit of using it. To be fair though, my Irish colleagues are running a challenge with a measured amount of fuel, and unofficially, reports are around 40miles more per tankful after the product has been applied by their customers.Test it yourself, and report your results to us here. Regards, Richard.