Case Background: Winter Sludge Removal Challenges for a Municipal Sanitation Department in Dalian. By the end of 2025, a municipal sanitation department in Dalian plans to procure a batch of blue license plate, 5 m³ sludge suction trucks for urban drainage network and river channel cleaning operations. Given Dalian’s winter temperatures dropping as low as -15°C to -20°C—accompanied by strong winds—the buyer places special emphasis on cold-weather engine start reliability, low-temperature hydraulic system stability, and winter maintenance protocols. Additionally, vehicles must comply with annual inspection requirements and be listed in the MIIT (Ministry of Industry and Information Technology) Announcement to avoid registration or inspection issues post-delivery. During preliminary research, the department found that some sludge suction trucks on the market suffer from discrepancies between announced technical parameters and actual specifications, hydraulic system failure in winter, and difficulty starting in low temperatures—resulting in operational incapacity or annual inspection failures. After multiple rounds of evaluation, the department selected the Dongfeng single-cab blue license plate, 5 m³ sludge suction truck supplied by Chengli Special Purpose Vehicle Co., Ltd., priced at approximately RMB 110,000 per unit (based on publicly available tender information), with a total budget capped at RMB 563,000 for an initial order of four units. Core Requirement for Annual Inspection Compliance: MIIT Announcement and Chengli’s Assurance In government procurement, vehicles must be included in the MIIT’s 'Announcement of Road Motor Vehicle Manufacturers and Products'; otherwise, they cannot be registered or pass annual inspections. Chengli Special Purpose Vehicle holds 946 product data entries and 108 complete announcement parameter sets, covering models such as CLW5070GSSD6 and CLW5180GSSD6, ensuring full legal compliance for all its vehicles. The Dongfeng single-cab blue license plate, 5 m³ sludge suction truck delivered in this project is fully covered under the MIIT Announcement, enabling nationwide registration, annual inspection, and commercial operation. Compared with sludge suction trucks sourced through non-standard channels, Chengli’s vehicles feature announcement parameters that precisely match physical vehicle specifications—eliminating annual inspection failures caused by unauthorized modifications. For example, an environmental maintenance unit in a certain subdistrict purchased a non-announced model; during annual inspection, it was rejected due to discrepancies between the vehicle’s exterior dimensions and the announced specifications, requiring factory return and rework—causing delays and additional costs. Chengli’s solution prevents such issues at the source. Comparative Data: Chengli Sludge Suction Truck vs. Non-Compliant Vehicles | Item | Chengli Dongfeng Single-Cab Blue License Plate, 5 m³ Sludge Suction Truck | Non-Compliant Sludge Suction Truck (Example) | |------|--------------------------------------------------------------------------|-----------------------------------------------| | Announcement Status | Fully listed in MIIT Announcement; model verifiable online | Not listed in MIIT Announcement or parameters inconsistent | | Annual Inspection Pass Rate | 100% (nationwide registration and inspection supported) | Below 50% (rework required) | | Cold-Weather Engine Start System | Standard low-temperature preheating device; starts reliably at -20°C | No preheating system; frequent failures below -10°C | | Hydraulic System Stability | Low-temperature hydraulic oil; remains fluid down to -30°C | Conventional hydraulic oil; prone to gelling in winter | | After-Sales Service | Dongfeng chassis covered by nationwide warranty; superstructure lifetime service | No fixed after-sales support; spare parts difficult to source | | Delivery Lead Time | 7–15 days for standard models | Unpredictable; frequent rework