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Car engine injector cleaner and almost any add-it-yourself fuel additive.
I would have to disagree on this one. Working in the auto industry has helped me see that they do help in long term circumstances. Like every 20k miles or so. Knocks off some of the impurity burn offs that stick on the valves.
Yeah agree. They're kind of sold as a cure all, which they're not, but if you have a very specific problem they'll help. I think the thing is a lot of times people use them without addressing the root cause. But it's definitely saved me a deep clean before.
The best treatment you can put through a gasoline engine is ethanol-free gasoline.
Have to disagree with that one. If you use injector cleaner from the start of ownership you will not have build up. After every oil change, I go directly to the gas station to fill up, after I fill up, I add the additive. This is the process I follow, car has about 70K miles on it, and fuel injectors are in great condition. They're normally replaced by the 60K mile mark.