Another popular marketing myth, perhaps you’ve seen some of the commercials out there claiming that using more expensive gasoline with ingredients like “Tekron from Chevron,” help avoid the excess build-up of engine deposits, but the opposite can actually be true. Automobile expert Mark Whinton argues it’s almost a complete fallacy that we’re all driving around in cars that are “gunked up” with grease and are need of extra cleaning from these added detergents.

The truth is, most of the today’s modern automobile engines are relatively clean and using too much of these additional cleansers can actually cause valves to stick. Industry experts note there is a “maximum efficacy level” with using these additives and it comes to a certain point where there’s no benefit to adding even more of these detergents to our fuel systems.