How often should the spark plugs of the Baojun 730 be replaced?

[SimonMarie]

The spark plugs of the Baojun 730 should be replaced every 40,000 kilometers. Spark plugs are devices used in gasoline engines to ignite the air-fuel mixture. They consist of a ceramic insulator on the outside, a metal conductor in the middle, and electrodes inside. Types of spark plugs include: 1. Standard spark plugs; 2. Projected insulator spark plugs; 3. Electrode spark plugs; 4. Seat-type spark plugs; 5. Pole-type spark plugs; 6. Surface-gap spark plugs. The working principle of a spark plug is: under the control of the engine, it introduces the high-voltage electricity generated by the ignition coil into the engine cylinder, creating a spark between the spark plug electrodes to ignite the air-fuel mixture, enabling the engine to operate normally.