The engine number is generally found on the outer surface of the engine block, or on the vehicle's nameplate, the nameplate in the engine compartment, or the purchase invoice. The engine number can also be found on the factory certificate, the operating permit for commercial vehicles, the vehicle purchase tax payment certificate, the registration record at the public security authority, the vehicle insurance card. The simplest and most direct method is to check the vehicle registration book or the vehicle's driving license. The engine number is like a person's ID number, representing each vehicle. It contains very important information about the vehicle. The engine model is an identification code assigned by the engine manufacturer in accordance with relevant regulations, industry or company practices, and the attributes of the engine. It represents information such as the manufacturer, specifications, performance, features, technology, purpose, and batch of the engine, including fuel type, number of cylinders, displacement, and static braking power. Engines installed in passenger cars or multi-purpose passenger vehicles are marked with the professional manufacturer's name, model, and production number as required. 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 range, and multiple engines can share the same model. The engine number, however, refers to the production number of the engine, where each engine has a unique number that cannot be duplicated. Composition of the vehicle engine number: Front part: Includes the product series code, generation symbol, and regional or company code. Manufacturers can choose appropriate letters as needed, but they must be approved and recorded by the industry standard authority. Middle part: Consists of symbols for the number of cylinders, cylinder arrangement, stroke, and cylinder diameter. Rear part: Comprises symbols for structural features and usage characteristics. Tail part: Distinguishing symbol. When differentiation is needed due to improvements or other reasons within the same series, the manufacturer selects an appropriate symbol. The rear and tail parts can be separated by a hyphen (-).
