Is it okay to add fuel additive after filling up the tank?
2 Answers
It is acceptable to add fuel additive after filling up the tank, but the mixing effect may be less optimal. The correct method is to add the fuel additive before refueling with gasoline, as this allows for thorough mixing under the impact of the gasoline flow, thereby achieving better performance. It's worth noting that while fuel additives can indeed improve fuel characteristics, prolonged use may have varying degrees of impact on the vehicle. There is also another type of fuel additive that works by increasing the fuel's anti-knock properties to reduce the likelihood of engine knocking. However, long-term use of this method can easily lead to carbon buildup and increased fuel consumption.
As a seasoned long-distance driver, I use fuel additives year-round. The best practice is to add the fuel additive first, then fill up the tank—this ensures thorough mixing from the fuel flow during refueling. If you've already filled up, adding the additive afterward still works, but remember to drive about 10 kilometers immediately to help them blend. I drive a direct-injection engine model, and following the manual, I pour half a bottle before each refueling, using it once every 5,000 kilometers. However, keep in mind that fuel additives are just that—additives. For new cars in their first two years, they're generally unnecessary; wait until after 30,000 kilometers to consider using them. Also, be careful not to pour the additive into the wrong compartment—I once saw someone embarrassingly pour it into the windshield washer reservoir.
