How Many Bottles of Fuel Additive Should Be Used Continuously?
2 Answers
New cars are not recommended to add fuel additives because new cars that have just been purchased have not been driven many kilometers, and their operating conditions are usually good, so there is basically no serious carbon buildup, making additives unnecessary. Adding Fuel Additives: For new cars with less than 20,000 kilometers, adding fuel additives is unnecessary. For vehicles exceeding 20,000 kilometers, they should be added as needed, typically one small bottle per tank of fuel. Hazards of Long-Term Use: Long-term use of fuel additives can be harmful to the engine. Excessive use may increase carbon buildup in the combustion chamber. If excessive amounts are added over a long period, it may even cause engine knocking, detonation, and worsen vehicle exhaust emissions.
I learned from a car mechanic that fuel system cleaners usually need to be used continuously for three to four bottles to be effective, with one bottle added per fuel refill. This is because carbon deposit removal isn't an instant process—it requires sustained cleaning. For example, in a car with a 50-liter fuel tank, using one bottle of fuel cleaner with a full tank of gas allows the cleaning agents to fully work inside the engine. For older cars over five years or vehicles frequently stuck in traffic, it's best to use five or more bottles consecutively. Don't stop after just one bottle—that's basically ineffective. Major brands like Chevron and 3M all recommend this approach. After completing one treatment cycle, you can switch to using one bottle every 5,000 kilometers for maintenance. Always choose genuine products, as counterfeit ones may damage the catalytic converter.