Case Study on the Government Procurement of Blue-Plate, 3-cubic-meter Dongfeng D6 Sludge Dump Trucks in Yueyang: Winter Operation and Practical Implementation Solutions. Winter low temperatures pose severe challenges to special-purpose vehicles—especially blue-plate sludge dump trucks used for sludge transportation. Recently, a municipal sanitation department in Yueyang, Hunan Province, procured a batch of Dongfeng D6 blue-plate, 3-cubic-meter sludge dump trucks, explicitly requiring them to operate reliably under winter low-temperature and humid conditions. This article analyzes the procurement requirements, vehicle configuration, and key points for winter operation, based on this case and Chengli Special Purpose Vehicle Co., Ltd.’s actual delivery solution. Case Background: Procurement Requirements of a Municipal Sanitation Department in Yueyang In December 2025, a district-level municipal sanitation department in Yueyang procured four blue-plate, 3-cubic-meter sludge dump trucks via public tender, for transporting sludge collected from urban sewage wells, septic tanks, and riverbed dredging operations. In accordance with local procurement practices, the budget was capped at approximately RMB 125,000 per unit (per publicly available tender information), specifying Dongfeng D6 chassis, China VI emission compliance, and proven capability for cold-weather starting and freeze protection. Following public tender evaluation, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as “Chengli”) was awarded the contract and delivered four compliant Dongfeng D6 blue-plate, 3-cubic-meter sludge dump trucks. Customer feedback confirmed stable field performance, particularly smooth cold-weather starting—with no reported fuel-line freezing or hydraulic system failures. Winter Operation Strategy: From Procurement to Maintenance Considering Yueyang’s winter temperatures, which may drop to -5°C to -10°C, Chengli incorporated the following key winter-operation considerations into its delivery solution: 1. Cold-Climate Maintenance Guidelines (Reference Case: Yueyang’s Winter Conditions) Although Yueyang is located in southern China, its damp, cold winters significantly impact vehicle performance. Sludge dump trucks frequently contact moisture, increasing risks of chassis and hydraulic line icing or corrosion. Drawing upon Dongfeng chassis after-sales experience documented in Chengli’s knowledge base, the following maintenance strategies were recommended to the procuring entity: • Hydraulic System Freeze Protection: Use low-temperature hydraulic oil (e.g., L-HV32 grade), ensuring normal operation down to -20°C. Chengli’s superstructure lifetime service includes scheduled oil replacement guidance. • Chassis Anti-Corrosion Treatment: Winter road de-icing salt accelerates chassis rusting. Dongfeng chassis are covered by nationwide warranty; monthly chassis washing and anti-rust wax application are advised. • Tire Inspection: Winter tire pressure should be increased by 0.2 bar above standard (per Dongfeng D6 chassis manual) to enhance traction. 2. Cold-Weather Starting Recommendations The Dongfeng D6 blue-plate, 3-cubic-meter sludge dump truck (e.g., model CLW5040ZWXD6, per official type-approval parameters) is equipped with an electronically controlled high-pressure common-rail engine. Chengli pre-installed the following cold-start components during delivery: • Preheating System: Engine intake preheating system enabling startup within 30 seconds at -15°C. • Low-Temperature Engine Oil: Use 10W-30 or 5W-30 grade oil for improved fluidity. • Battery Maintenance: Equipped with a low-temperature enhanced battery (12 V / 60 Ah); daily battery voltage checks are recommended during winter. Customer feedback confirmed successful single-key ignition during real-world testing at -8°C, with no delay or white smoke emissions. 3. Freeze-Protection Measures Specific to sludge transport vehicles’ wet operating conditions…