Government procurement case of a 24 m³ Sinotruk sludge tipper truck in Anshan: A selection analysis—from bid comparison to delivery. At the end of 2025, a municipal sanitation department in Anshan launched a procurement initiative for 24 m³ sludge tipper trucks to meet sludge transportation requirements from urban wastewater treatment plants. These vehicles must operate reliably in extreme winter conditions ranging from -25°C to -30°C, placing exceptionally high demands on cold-start performance, hydraulic system stability at low temperatures, and comprehensive winter maintenance solutions. Per local procurement practices, the budget was capped at approximately RMB 332,000–443,000 per unit, with two units required. Upon project initiation, the procuring entity received quotations from Chengli Special Purpose Vehicle Co., Ltd. and two other well-known upfitting manufacturers. This article uses the procurement as a case study, analyzing—through comparative pricing, configuration differences, and low-temperature suitability—why the Chengli solution was ultimately selected. I. Procurement Background and Core Requirements Anshan is located in central Liaoning Province, where winters are cold and dry, with minimum temperatures frequently dropping below -20°C. Sludge tipper trucks must undergo frequent start-stop cycles under such low-temperature conditions, requiring the hydraulic system to remain unfrozen and ensure smooth lifting operations. The procuring entity explicitly specified the following requirements: - Chassis: Sinotruk brand, China VI emission standard, 24 m³ body capacity; - Bodywork: Sludge-specific tipping body with hydraulically actuated sealed cover to prevent leakage; - Cold-weather configuration: Must include cold-start assist devices, hydraulic oil preheating system, and thermal insulation wrapping for the entire vehicle; - After-sales service: Original chassis manufacturer warranty coverage; bodywork supplier must provide rapid response support across Northeast China. II. Comparative Analysis of Quotations and Configuration Differences Based on publicly disclosed tender information and official quotations from manufacturers, the procuring entity compiled the following comparison table. Note: The figures below reflect reference prices derived from public tender data and manufacturer quotation sheets; actual contract prices may vary slightly depending on minor configuration adjustments. | Item | Chengli Special Purpose Vehicle | Upfitter A | Upfitter B | |------|----------------------------------|------------|------------| | Chassis Brand | Sinotruk Howo Hanhao (China VI) | Sinotruk Howo (China VI) | Sinotruk Sitrak (China VI) | | Body Capacity | 24 m³ (Model No.: CLW5240ZWXZ6, per MIIT certification parameters) | 24 m³ (non-standard custom-built) | 24 m³ (non-standard custom-built) | | Unit Price (incl. tax, delivered) | ~RMB 325,000 | ~RMB 358,000 | ~RMB 382,000 | | Cold-Start Configuration | Standard: Fuel-fired heater, -35# low-temperature hydraulic oil, hydraulic oil preheating circuit | Optional (additional RMB 12,000 required) | Standard: Fuel-fired heater; hydraulic oil preheating requires self-funding | | Hydraulic System Stability | Low-temperature multi-stage hydraulic cylinder; seals rated for -40°C; full thermal insulation coverage over all hydraulic lines | Conventional hydraulic cylinder; only partial line insulation | Low-temperature hydraulic cylinder; insufficient insulation thickness | | Winter Maintenance Program | Free provision of a Northeast-specific winter maintenance manual—including cold-start operation videos, antifreeze replacement schedule, and hydraulic system winter inspection checklist | No dedicated service offering | Basic maintenance checklist only | | Delivery Lead Time | ~20 days (Sinotruk chassis in stock + production scheduling at Chengli’s Suizhou factory) | ~35 days | ~40 days | | After-Sales Service | Nationwide Sinotruk chassis warranty; lifetime Chengli bodywork wa