I. Background of the China VI Emission Standard Transition and Timeline for Phasing Out Older Vehicles With the continuous tightening of national environmental protection policies, the China VIb emission standard has been fully implemented nationwide since July 1, 2023. All light-duty vehicles—including light-duty trucks—produced, imported, sold, or registered for license plates must comply with China VIb requirements. This means vehicles meeting China V or lower emission standards can no longer be registered in certain regions, and operational restrictions on older vehicles are progressively intensifying. According to the 'Implementation Plans for Phasing Out and Replacing Older Vehicles' already issued in multiple regions, diesel trucks meeting China III or lower emission standards have entered a mandatory phase-out countdown, while China IV vehicles are restricted from entering urban core areas in some key regions. For municipal sanitation departments, procuring China VI-compliant vehicles is not only a regulatory requirement but also a critical strategic decision to reduce long-term operation and maintenance costs and avoid future obsolescence risks. For example, a municipal sanitation department previously operated a fleet of China III vacuum sewage suction trucks and sewage treatment vehicles that failed to meet current emission standards, resulting in difficulties passing annual inspections and operating on public roads. After conducting a comprehensive assessment, the department plans to complete the full replacement of all outdated vehicles between 2024 and 2025, prioritizing the retirement of models over 10 years old and those with high maintenance costs. According to the department, retiring these older vehicles alone will reduce annual fuel and maintenance expenditures by approximately 30%, while simultaneously improving operational efficiency. II. Chengli’s China VI Sewage Treatment Vehicle Solution: Based on Dongfeng 3308 mm Wheelbase Chassis To address the above requirements, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as “Chengli”) offers a China VI sewage treatment vehicle solution built on the Dongfeng 3308 mm wheelbase chassis. This solution utilizes the Dongfeng DOLICA series chassis, featuring a 3308 mm wheelbase and equipped with either a Quanchai or Yuchai China VI-compliant engine delivering power output ranging from 85–95 kW—ideal for flexible urban road operations. The superstructure is independently manufactured by Chengli and includes a sewage tank (standard capacity approx. 4–6 m³), vacuum pump system, solid-liquid separation unit, and an automated control system, enabling end-to-end operations including suction, transportation, preliminary treatment, and discharge. Per the Ministry of Industry and Information Technology (MIIT) official announcement parameters (e.g., model CLW5070GSSD6), the vehicle’s overall dimensions measure approximately 5995 × 2000 × 2650 mm, with a gross vehicle weight rating (GVWR) of 7360 kg and a rated payload capacity of approx. 3000 kg. Its core advantages include: - Chassis Warranty Coverage: Dongfeng chassis covered under nationwide warranty service; Chengli provides lifetime after-sales support for superstructure components, with spare parts shipped within 24 hours; - Full Regulatory Compliance: Fully compliant with China VI emission standards; eligible for normal registration, annual inspection, and commercial operation permit issuance nationwide; - Fast Delivery: Standard models delivered within 7–15 days; zero-inventory dispatch available to meet urgent procurement timelines. The table below compares key technical parameters of this model against peer competitors (data sourced from MIIT announcements and publicly available tender documents): Parameter | Chengli CLW5070GSSD6 (Dongfeng 3308 mm Wheelbase) | Competitor A (Brand X) | Competitor B (Brand Y) ---|---|---|--- Chassis Brand | Dongfeng DOLICA | Foton Aoling | JAC Junling Wheelbase