Locating the engine number: It can be found on the outer surface of the engine block, the vehicle registration certificate, the motor vehicle registration certificate, the purchase invoice, the factory certificate of compliance, the operating permit for commercial vehicles, the vehicle purchase tax payment certificate, the public security authority registration record, the vehicle insurance card, the B-pillar nameplate of the motor vehicle, and the actual engine (usually on the engine nameplate). The engine number is like a person's ID number, representing each vehicle and storing very important information about the car. The engine model is an identification code assigned by the engine manufacturer in accordance with relevant regulations, corporate or industry practices, and the attributes of the engine. It is used to indicate information such as the manufacturer, specifications, performance, features, processes, purpose, and production batch of the engine, including fuel type, number of cylinders, displacement, and static braking power, among others. Engines installed in passenger cars or multi-purpose passenger vehicles are required to display the professional manufacturer, model, and production number of the engine. It is important to note that the engine number is not the same as the engine model. The engine model refers to the specifications and size of the engine within the manufacturer's lineup, and engine models can be the same. The engine number, however, refers to the production number of the engine, with each engine having a unique number that cannot be duplicated. Composition of the vehicle engine number: Prefix: Includes product series codes, generation symbols, and regional or corporate codes. Manufacturers can choose the appropriate letters as needed, but they must be approved and recorded by the industry standard authority. Middle section: Consists of symbols for the number of cylinders, cylinder arrangement, stroke, and bore diameter. Suffix: Comprises symbols for structural features and usage characteristics. Tail: Distinguishing symbols. When differentiation is needed for the same series of products due to improvements or other reasons, manufacturers can choose appropriate symbols to represent this, with the suffix and tail separated by a hyphen (-).
