Shenyang Sinotruk 24-cubic-meter sludge tipper truck government procurement case: Vehicle selection strategy for northern winter operations. In Northeast China, winters last up to five months, with temperatures frequently dropping below -30°C—imposing stringent requirements on the selection of sanitation special-purpose vehicles. In 2024, a municipal sanitation department in Shenyang completed the procurement of 10 units of 24-cubic-meter sludge tipper trucks, featuring Sinotruk chassis and superstructures supplied by Chengli Special Purpose Vehicle Co., Ltd. These vehicles are primarily used for enclosed transportation of sludge from municipal wastewater treatment plants, operating along urban main roads and suburban landfill sites. This article adopts a 'residual value' perspective, integrating tender specifications from this case, market feedback after three years of actual operation, and the residual value characteristics of Chengli models, providing Northeast-region sanitation authorities with a practical procurement reference guide. I. Second-hand market price after three years: The 'residual value code' for sludge tipper trucks in Northeast China In the Northeast specialized vehicle market, the circulation rate of second-hand sludge tipper trucks is relatively low; however, their residual value is directly linked to vehicle configuration, chassis brand, superstructure material, and winter adaptability. According to publicly available data from a Shenyang-based second-hand vehicle trading market, a 24-cubic-meter Sinotruk-chassis sludge tipper truck purchased in 2019 achieved a resale price of approximately 58%–65% of its original landed cost in 2022—provided it remained in good condition. By contrast, certain low-specification models during the same period retained less than 45% of their original value. In this case, the 10 units of 24-cubic-meter sludge tipper trucks procured by the Shenyang municipal sanitation department had an approximate unit price of RMB 400,000–450,000, based on publicly disclosed tender information. According to customer feedback collected by Chengli Special Purpose Vehicle across Northeast China, such models—when properly maintained (especially ensuring no hydraulic system corrosion and no engine freeze-cracking during winter)—can sustain a second-hand market price of 55%–62% of their original landed cost after three years. This resilience stems primarily from the high durability of Sinotruk chassis and Chengli’s corrosion-resistant superstructure finishing processes. II. Residual value comparison of Chengli models: Why do Northeast users prefer Sinotruk chassis? Chengli Special Purpose Vehicle offers sludge tipper trucks equipped with various chassis options, including Dongfeng, Sinotruk, and FAW Jiefang. In the Northeast market, Sinotruk chassis enjoys higher residual value than competing brands due to superior cold-start engine performance, transmission cold-weather reliability, and extensive parts distribution network. Model (Chassis Brand) | Approx. Landed Price | Second-hand Market Price After 3 Years | Residual Value Range | Key Winter Adaptability Features Chengli CLW5310ZWXZZ6 (Sinotruk Chassis) | ~RMB 420,000 | ~RMB 230,000–260,000 | 55%–62% | -30°C frost-proof starting, low-temperature hydraulic stability Chengli CLW5310ZWXZZ6 (Dongfeng Chassis) | ~RMB 380,000 | ~RMB 190,000–220,000 | 50%–58% | Requires pre-heating device; hydraulic oil must be replaced with low-temperature grade Chengli CLW5310ZWXZZ6 (FAW Jiefang Chassis) | ~RMB 400,000 | ~RMB 200,000–240,000 | 50%–60% | Limited service network coverage in northern regions; longer parts lead times Non-Chengli 24-cubic-meter sludge tipper trucks (other brands) | ~RMB 350,000–400,000 | ~RMB 150,000–200,000 | 40%–50% | High winter failure rate; elevated maintenance costs As shown in the table above, Chengli-Sinotruk