Government procurement case of Dongfeng single-cab sludge suction truck (blue license plate, 5 m³) in Shenyang: Chassis selection and low-temperature solution analysis. In Northeast China—especially in severely cold cities like Shenyang—the core challenge for municipal sanitation departments when procuring sludge suction trucks goes beyond vehicle price or tank capacity; it lies in ensuring reliable engine start-up, stable hydraulic system operation, and convenient long-term chassis maintenance under -30°C conditions. This article analyzes a recent procurement case by a municipal sanitation department in Shenyang involving a Dongfeng single-cab blue license plate 5 m³ sludge suction truck, focusing on chassis selection, low-temperature adaptability, and maintenance convenience, supported by real product data and tender information from Chengli Special Purpose Vehicles. I. Case Background: Why Choose the Dongfeng Single-Cab Blue License Plate 5 m³ Model? In winter 2025, a municipal sanitation department in Shenyang planned to procure a batch of blue license plate sludge suction trucks to address sludge removal requirements for aging urban pipelines, stormwater inlets, and septic tanks. Following local procurement conventions, the budget was capped at approximately RMB 133,000–166,000 per unit, with mandatory requirements including C1 driver’s license operability, convenient urban maneuverability, and reliable operation under extreme cold weather. After multiple rounds of technical comparison, the department ultimately selected Chengli’s Dongfeng single-cab chassis-based blue license plate 5 m³ sludge suction truck solution. This solution is built upon the Dongfeng single-cab chassis, integrated with Chengli’s proprietary superstructure, referencing model numbers such as CLW5070GSSD6 and related official announcement parameters. According to feedback from the department, Dongfeng’s superior after-sales service network density in Northeast China, rapid spare parts supply, and proven cold-weather starting performance were decisive factors in its selection. II. Chassis Selection Comparison: Dongfeng vs. Sinotruk HOWO, Foton Ouman, FAW Tiger V In the blue license plate sludge suction truck segment, mainstream chassis options include Dongfeng, Sinotruk HOWO, Foton Ouman, and FAW Tiger V. The following comparative analysis is based on Chengli’s internal product database and actual usage experience in Shenyang: Comparison Dimension Dongfeng Single-Cab (Recommended) Sinotruk HOWO Foton Ouman FAW Tiger V Engine Type CN6 diesel, commonly Yuchai/Quanchai engines, power output 110–130 hp CN6 diesel, Weichai/Yunnei engines, power output 120–140 hp CN6 diesel, Foton Cummins engine, power output 130–150 hp CN6 diesel, FAW Power engine, power output 120–140 hp Cold-Start Performance Standard preheating device; ≥95% start success rate at -30°C Preheating optional; additional preheating equipment required below -25°C Standard preheating; however, limited Foton service coverage in Northeast China Standard preheating; moderate performance at -30°C Hydraulic System Stability Superstructure hydraulic circuit equipped with low-temperature heating jacket; oil temperature rapidly rises to 5°C Requires custom low-temperature hydraulic oil, increasing cost by ~RMB 2,000 Standard low-temperature hydraulic valves; heating for hydraulic lines optional Standard low-temperature hydraulic valves; standard pipe insulation only Load Capacity & Maneuverability Front axle: 2.5T, rear axle: 5T; wheelbase: 3,300 mm; small turning radius Front axle: 3.0T, rear axle: 6T; wheelbase: 3,400 mm; slightly wider Front axle: 2.8T, rear axle: 5.5T; wheelbase: 3,360 mm Front axle: 2.8T, rear axle: 5.5T; wheelbase: 3,300 mm Maintenance Convenience (Shenyang Region) Three authorized Dongfeng service stations in Shenyang