Bests & Worsts Reviews from Amazon

This is the stuff, the real concentrated stuff. The version labeled 'Techron Fuel Injector Cleaner', which is for example what Costco sells, is the same stuff, just a much lower concentration. If you are having fuel system problems, and think Techron might cure it, you want this concentration. The other version is better suited for regular use to try and prevent problems, but I still prefer this version for that task.