Our country has clear regulations that private passenger cars will not be scrapped, but will be scrapped after driving to 600 thousand kilometers. In addition, the mandatory retirement life of light goods and large items is 10 year, but it can be delayed by 5 years at the longest, that is, the longest mandatory retirement life of the national third truck is 15 year. Therefore, the third car can still be audited normally. If the car condition is normal, the third car can theoretically be driven for 48 years.

The national third automobile refers to the automobile that meets the national third emission standard. The so-called national three standards are the third-stage automobile emission standards in China. In the third stage, the national emission standard is equivalent to the European emission standard, that is to say, the content of exhaust pollutants is equivalent to the European emission standard, but the difference is that new cars must be equipped with OBD (on-board self-diagnosis system). According to Announcement No.5 of the State Environmental Protection Administration in 2006 "Announcement on Issuing New Motor Vehicle Models and Engine Models Meeting the Emission Limits of the Second and Third Stages of the National Motor Vehicle Emission Standards", the national III standard is mainly applicable to 3-and 5-ton light gasoline vehicles and diesel vehicles, which is equivalent to the Euro III standard.