1. Improve the low temperature fluidity of the fuel oil;

2. Effectively eliminate the deep carbon deposit of the fuel system to ensure fuel system cleaning, and provide best lubrication protection;

3. Improve the combustion efficiency and save the fuel oil;

4. Reduce wear of the fuel system parts and prolong the service life of the oil pump, fuel injector and engine;

5. Effectively reduce emission of harmful gases of the engine to reduce pollution and protect environment.

Before refueling, the diesel protective agent C990 is added to the fuel tank at the proportion of 0.08%-0.1%, equivalent to 8-10ml C990 added to every 10L fuel.