The engine number is usually found on the outer surface of the engine cylinder block, or on the vehicle's nameplate or the engine compartment nameplate. The simplest and most direct method is to check the vehicle's administrative green book or the vehicle registration certificate. The engine number, like a person's ID number, represents each vehicle and contains very important information about the vehicle. The chassis number is stamped on the vehicle's frame. The specific location varies by manufacturer, and you can refer to your vehicle's manual for details. The engine model is an identification code assigned by the engine manufacturer in accordance with relevant regulations, industry or company practices, and the engine's attributes to a batch of identical products. 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 marked with the professional manufacturer's name, model, and production number as required. The chassis number is a commonly used term, and its professional name is the Vehicle Identification Number (VIN). It is a unique code assigned by the manufacturer to identify a vehicle. The VIN consists of 17 alphanumeric characters, 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 referred to as the 'car's ID card.' It is usually found in the following locations: the vehicle registration certificate and the lower left side of the front windshield. 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 product line, and multiple engines can share the same model. However, the engine number is the production serial number of the engine, and each engine has a unique number. Composition of the Engine Number: Front Part: Includes the product series code, generation symbol, and regional or company code. The manufacturer 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. End Part: Distinguishing symbol. If differentiation is required due to improvements or other reasons within the same series, the manufacturer may choose an appropriate symbol. The rear and end parts can be separated by a hyphen. The chassis number consists of 17 characters, which can be 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).
