1. prevent the muffler from entering the water. When driving or washing the car in rainy days, the water inside the muffler should be prevented. When the water, should start the engine idling hot car for at least 10 minutes, try to make internal water discharge. This is crucial! 　　

2. it is recommended to add rust protection oil inside the muffler, and the specific way to refuel is: 　　

1) remove the muffler and block the minimum drainage hole in the middle of the muffler; 　　

2) after starting the engine, the muffler temperature gradually rises, occurrence of volatile oil is heated, the muffler tail will take the blue smoke. But the blue smoke will disappear after 20 km. The blue smoke disappeared after the blockage of drainage holes cancel; 　　

3) add about 50ml antirust oil from the flange connected to the muffler and engine, shake the muffler to let the rust oil into the cylinder evenly, and then install the muffler; 　　

4) suggest a new car on the card after a refueling maintenance, usually every half a year refueling maintenance.
　
Two, on the prevention of muffler discoloration: 　　

The 1. winter cold car is hard to start, close the choke after starting the engine, when attention will choke open in time. It is forbidden to travel at high speed for a long time under the condition of closing the damper;
　　
2. engine valve clearance and carburetor, air filter should be timely and correct adjustment and cleaning according to the vehicle, such as the valve clearance ordered the mixture too thick, too thin will affect the combustion, the impact on muffler cause discoloration.
　　
3. do not run for a long time, heavy load, low grade, which will cause damage to the engine and muffler; 　
　
4. when the surface oil, the car will make its surface color to color yellow, blue etc.. In addition, when the muffler surface with a large number of dirt and other dirt, please clean up in time, so as not to affect its heat dissipation; 　
　
5. when installing the muffler, attention should be paid to the installation of the muffler pad in place, and fastening, to prevent leakage, affect the noise elimination effect and cause the muffler interface yellow; 　
　
6. do not throttle the throttle at high speed for a long time;