Is there any impact if you add too much Hailong Diesel Fuel Treasure? If you use Hailong Diesel Fuel Treasure for a long time, it will be harmful to the engine. If it is used excessively, it will increase the carbon deposits in the combustion chamber. If it is used for a long time, Excessive addition may even cause engine knocking, knocking, etc., and vehicle exhaust emissions will also worsen. For new cars with a mileage of less than 20,000 kilometers, there is no need to refill. Vehicles with a mileage of more than 20,000 kilometers should be refilled as needed, generally one bottle of oil per tank. There is absolutely no need to use fuel treasure in new cars. Not to mention that the quality of fuel treasures on the market varies. Considering that the quality of additional additives added to the fuel tank varies, these additional oil parameters may not be taken into consideration when producing cars. Long-term use may also cause Side effects, affecting the oil atomization effect. Therefore, when the new car is in good working condition, it is not recommended to use fuel treasure.