Can Fuel Additives Clean Carbon Deposits?
2 Answers
Fuel additives can clean carbon deposits. The additives contain multiple cleaning groups that can dissolve and adsorb carbon deposits wherever gasoline flows, including the injector, intake valve, and piston. However, the effect is not immediate—it requires continuous use for over 1,000 kilometers to become noticeable. For some direct-injection engines, the cleaning effect is relatively limited because gasoline does not come into contact with the intake valve. Fuel additives can be categorized by usage into gasoline additives and diesel additives, and by function into three types: cleaning type, maintenance type, and performance-enhancing type. Both cleaning and maintenance types contain cleaning agents in their chemical compositions, which can effectively clean or inhibit the formation of engine carbon deposits.
I've been driving for over a decade and encountered carbon deposit issues several times. That time when the engine idled roughly with severe shaking, had sluggish acceleration, and ridiculously high fuel consumption. Tried fuel additives - poured them into the tank and ran through several tanks of gas, the effect was remarkable: shaking reduced, throttle response improved slightly, and fuel consumption dropped by about 8%. But additives only work for mild carbon deposits, like nozzle and small orifice deposits; severe blockages still require professional cleaning. Carbon buildup is a common ailment for older cars, caused by short-distance driving or low-quality fuel, and long-term neglect can damage the engine. Now I use additives every 5,000 km as prevention, always choose reputable brands, and supplement with premium fuel. Developing good habits is much cheaper than repairing the car.
