I. Introduction: Procurement Context in Dalian and Core Pain Points In winter 2024, a municipal sanitation department in Dalian issued a tender explicitly requiring procurement of a batch of China VI emission-compliant sewage treatment vehicles, specifically for emergency maintenance of urban sewage networks and low-temperature winter operations. The buyer prioritized three critical criteria: whether the vehicle can pass annual inspection smoothly, whether it can start reliably at -15°C, and whether its hydraulic system remains stable under low-temperature conditions. After multiple rounds of technical evaluation and real-world testing, Chengli Special Purpose Vehicle’s Dongfeng 3308 mm wheelbase sewage treatment vehicle was selected and delivered—five units in total, all operating stably to date. This article explains Chengli’s compliance assurance logic from the perspective of annual inspection requirements, supported by actual usage cases in Dalian. II. Annual Inspection Compliance: From MIIT Announcement to Local Registration 2.1 Complete MIIT Announcement Is the 'Passport' for Annual Inspection According to China’s 'Technical Requirements for Motor Vehicle Operation Safety' and 'Announcement of Road Motor Vehicle Manufacturers and Products', special-purpose vehicles must possess an official model number announced by the Ministry of Industry and Information Technology (MIIT) to be legally manufactured, sold, registered, and operated. Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') maintains a product database of 946 entries covering 44 categories—including water-sprinkling trucks, garbage trucks, and sewage treatment vehicles—with 108 fully compliant MIIT announcement parameters (e.g., CLW5070GSSD6, CLW5180GSSD6), ensuring nationwide registration, annual inspection, and commercial operation for every unit. In this Dalian procurement, Chengli’s Dongfeng 3308 mm wheelbase sewage treatment vehicle utilizes a Dongfeng chassis and fully complies with China VI emission standards, backed by complete MIIT announcements. The municipal sanitation department specifically stipulated in its tender documents: 'Vehicles must meet China’s latest environmental emission standards and be eligible for routine annual inspection at Dalian’s Vehicle Administration Office.' Leveraging its comprehensive MIIT announcement records and Dongfeng chassis’ nationwide warranty network, Chengli successfully passed the qualification review. 2.2 Lessons from Non-Compliant Vehicles: The 'Annual Inspection Blockage' Incident in a Dalian Subdistrict In 2023, an environmental maintenance unit in a Dalian subdistrict purchased a batch of non-announced sewage treatment vehicles. Due to absence from the MIIT announcement list, these vehicles were rejected during registration by the local Vehicle Administration Office and subsequently failed annual inspection—resulting in their return to the manufacturer, causing approximately RMB 300,000 in direct losses and a two-month operational delay. This case triggered widespread caution across Dalian’s municipal procurement community. As a manufacturer with 114 verifiable tender records—including 31 direct wins—Chengli’s full MIIT announcement coverage serves as a 'hard guarantee' for annual inspection compliance. III. Freeze-Resistant Starting Performance: A Lifeline for Winter Operations in Dalian Located on the Liaodong Peninsula, Dalian experiences winter lows of -15°C to -20°C—a severe challenge for vehicle starting systems. Chengli’s Dongfeng 3308 mm wheelbase sewage treatment vehicle incorporates targeted enhancements to ensure reliable cold-weather starting: • Battery Upgrade: Standard-fit low-temperature, high-rate batteries deliver sufficient cranking current even at -20°C. • Fuel System Heating: Integrated fuel pre-heating device prevents diesel gelling, eliminating startup delays. • Engine Cold-Start Assistance: Equipped with intake air pre-heaters and coolant heaters to sign