The engine number is usually found on the outer surface of the engine block, on the car's nameplate, or on the nameplate inside the engine compartment. The simplest and most direct method is to check the vehicle's administrative green book or the vehicle registration certificate. The engine number is like a person's ID number, representing each vehicle and containing very important information about the vehicle. The chassis number is stamped on the vehicle's frame. The exact location varies by manufacturer, so you can refer to your vehicle's manual. 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 represents information such as the manufacturer, specifications, performance, features, technology, purpose, and production batch of the engine, including fuel type, number of cylinders, displacement, and static braking power. Engines installed in cars or multi-purpose passenger vehicles are required to display the professional manufacturer, model, and production number. The chassis number, commonly referred to as the Vehicle Identification Number (VIN), is a unique code assigned by the manufacturer to identify a vehicle. The VIN consists of 17 alphanumeric characters and is also known as the 17-digit identification code, chassis number, or 17-digit number. The combination of these characters ensures that no two vehicles of the same model will have the same number within 30 years, making it a unique identifier for the vehicle, often called the "car's ID card." It is typically found in the following locations: on the vehicle registration certificate and on the lower left side of the front windshield. It's 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 multiple engines can share the same model. The engine number, however, is the production number of the engine, and each engine has a unique number. Structure of the Engine Number: Prefix: Includes the product series code, generation symbol, and regional or corporate code, which are selected by the manufacturer and must be approved and filed by the relevant industry standardization body. Middle Section: Consists of symbols for the number of cylinders, cylinder arrangement, stroke, and cylinder diameter. Suffix: Comprises symbols for structural features and usage characteristics. Tail: A distinguishing symbol. If differentiation is needed due to improvements or other reasons within the same series, the manufacturer selects an appropriate symbol. The suffix and tail may be separated by a hyphen. The chassis number consists of 17 characters divided into three parts. Part 1: WMI—World Manufacturer Identifier (positions 1–3); Part 2: VDS—Vehicle Descriptor Section (positions 4–9); Part 3: VIS—Vehicle Identifier Section (positions 10–17).
