Although most engine oil and gasoline varieties work fine on their own, sometimes they could use a little help with an additive.

Fuel injector cleaners are probably the easiest engine additive to use, and drivers can do it even if they have no tools or a garage.

Fuel injector cleaners remove dirt and residue to improve engine performance and efficiency. Learn how they work and choose the best one for your car.

John Paul, AAA Northeast's Car Doctor, answers a question from a reader curious about using Marvel Mystery Oil.

Top Tier gasoline contains more effective detergents than federally required, which helps clean fuel injectors and reduce harmful carbon deposits inside the engine.