Government Procurement Case and Bid-Winning Solution Analysis of the Dongguan 3308 Sewage Treatment Vehicle EHY5045TWCE6 Against the backdrop of the nationwide full transition to China VI emission standards, a municipal sanitation department in Dongguan recently procured the 3308 sewage treatment vehicle (model EHY5045TWCE6) manufactured by Chengli Special Purpose Vehicle Co., Ltd. through public tender. This case not only reflects the mandatory demand for upgrading sanitation vehicles driven by the China VI transition but also demonstrates Chengli’s technical adaptation solutions for hot and humid environments. This article provides an in-depth interpretation of the procurement case from five dimensions: policy background, phased-out timeline for legacy vehicles, Chengli’s China VI solution, overlapping subsidy policies, and frequently asked questions. I. Policy Background of the China VI Transition: Mandatory Upgrading and Regional Differentiation Effective July 1, 2021, China VI emission standards for heavy-duty diesel vehicles were implemented nationwide. As a core city in the Pearl River Delta, Dongguan enforces stricter air quality controls and has advanced its emission requirements for sanitation vehicles to the China VIb stage. According to the 'Guangdong Province 2023 Atmospheric Pollution Prevention and Control Work Plan', Dongguan explicitly mandates: by the end of 2025, essentially eliminate sanitation vehicles meeting China III or lower emission standards; and by the end of 2027, achieve a minimum 50% replacement rate for China IV-emission sanitation vehicles. These policies directly triggered the procurement demand for this 3308 sewage treatment vehicle. In its procurement documents, the municipal sanitation department explicitly required suppliers to provide chassis compliant with China VI emission standards, and the complete vehicle must be listed in the latest Ministry of Industry and Information Technology (MIIT) announcement (e.g., models such as CLW5070GSSD6). Chengli’s EHY5045TWCE6 utilizes a Dongfeng chassis equipped with a China VI-compliant engine, satisfying Dongguan’s local environmental registration requirements—making it a key competitive advantage in the winning bid. II. Phased-Out Timeline for Legacy Vehicles: Analysis of Dongguan’s Sanitation Vehicle Replacement Pressure Approximately 30% of Dongguan’s existing sanitation fleet comprises China IV and earlier vehicles registered before 2015. Per local policy, these vehicles must be progressively retired between 2025 and 2027. For instance, the newly procured 3308 sewage treatment vehicle replaces an older China III vacuum suction truck registered in 2013, which was decommissioned due to excessive emissions and high maintenance costs (average annual repair cost ~RMB 25,000). Chengli’s EHY5045TWCE6 not only meets emission standards but also features a stainless-steel tank with anti-corrosion coating—specifically engineered for Dongguan’s coastal climate characterized by high temperature, frequent rainfall, and high humidity—extending service life by over 40%. Based on publicly available tender information, the procurement unit price for this vehicle is approximately RMB 280,000, well within the budget ceiling of RMB 337,000—consistent with regional procurement norms for comparable models. As a direct manufacturer, Chengli offers savings of RMB 8,000–15,000 versus 4S dealership channels for identical configurations. Moreover, with production based in Suizhou, standard models can be delivered within 7–15 days, effectively alleviating urgent fleet-replacement timelines. III. Chengli’s China VI Solution: Anti-Corrosion Coating and Technical Adaptation for Hot-Humid Environments Located in a subtropical monsoon climate zone, Dongguan experiences an average annual relative humidity of 80%, with frequent rainy-season operations—posing exceptionally high demands on sealing component durability and corrosion resistance for sewage treatment vehicles.