For diesel:
Lubricating anti-wear additives - a mixture of organic compounds based on fatty acids, used to improve the performance characteristics of diesel fuel, namely reducing the diameter of the wear spot;
Cetane-boosting additives.
In internal combustion engines running on diesel fuel, the cetane number is the most important characteristic of the fuel ignition process. The higher the cetane number, the faster the fuel-air mixture ignites in the combustion chamber. If the cetane number is low, the ignition of the mixture is delayed and instead of a gradual increase in pressure, there is a sharp explosion of the fuel accumulated in the combustion chamber. To increase the cetane number of diesel fuels, cetane-increasing additives are used. Depressor additives- help to reduce the ultimate filterability temperature and pour point of the diesel engine.
For gasoline and jet fuel:
Antioxidant stabilizing additives - protect unstable fuels from oxidation by air oxygen and polymerization.
Anti-static additives - reduce the surface tension of fuel, improving mixing and reducing the potential for static electricity buildup, which ensures safe fuel transfer and refueling.