Procurement Case Study of a 3308-Wheelbase Sewage Treatment Vehicle by a Municipal Sanitation Department in Yinchuan: Selection and Comparative Pricing Analysis under Low-Temperature Conditions. In early 2026, a municipal sanitation department in Yinchuan planned to procure a 3308-wheelbase sewage treatment vehicle (model EHY5045TWCE6) to meet local sewer network cleaning and wastewater treatment needs. This model is commonly used for emergency sewage discharge, septic tank cleaning, and river remediation; however, winter temperatures in Yinchuan can drop below -20°C, imposing stringent requirements on cold-start capability, hydraulic system stability, and winter maintenance. This article analyzes the department’s real procurement process—including comparative quotations, configuration differences, and rationale for selecting Chengli Special Purpose Vehicles—to provide reference for buyers in northern China. I. Procurement Background and Core Requirements According to publicly released tender information, the department required a 3308-wheelbase sewage treatment vehicle compliant with China VI emission standards and with a gross vehicle weight not exceeding 4,495 kg, intended for residential septic tank cleaning and emergency drainage operations. Key evaluation criteria included: • Cold-Start Performance: Reliable engine start at -20°C, requiring low-temperature batteries, antifreeze coolant, and heating devices. • Low-Temperature Hydraulic Stability: Hydraulic oil must remain fluid at sub-zero temperatures; hydraulic lines must maintain excellent sealing integrity to prevent leakage. • Winter Maintenance Plan: The supplier must provide localized winter maintenance support, including antifreeze replacement, appropriate hydraulic oil grade selection, and cold-start operation guidelines. II. Quotation Comparison and Analysis The department received quotations from three suppliers—all offering the EHY5045TWCE6 model (with chassis options including Dongfeng or Foton) manufactured by Chengli Special Purpose Vehicles—yet differing significantly in configuration and pricing. Based on publicly available tender data, the quotation range was as follows: Yinchuan EHY5045TWCE6 Sewage Treatment Vehicle Quotation and Configuration Comparison Table Comparison Item | Supplier A (Dealer) | Supplier B (Bodybuilder) | Supplier C (Chengli Direct Sales) Chassis Model | Dongfeng 3308 | Foton 3308 | Dongfeng 3308 Total Price (Tax-Inclusive, Delivered) | ~¥305,000 | ~¥282,000 | ~¥268,000 Cold-Start Configuration | Standard Battery + Antifreeze | Low-Temp Battery + Antifreeze + Heater | Low-Temp Battery + Antifreeze + Heater + Cold-Start Module Hydraulic System | Standard Hydraulic Oil | -35°C Hydraulic Oil + Insulated Lines | -40°C Hydraulic Oil + Insulated Lines + Hydraulic Preheating Winter Maintenance Service | No Special Service | Free First-Year Winter Inspection | Lifetime After-Sales Support + Comprehensive Winter Maintenance Plan + 24-Hour Direct Spare Parts Dispatch Delivery Lead Time | 30 Days | 20 Days | 12 Days (Zero-Inventory Shipment) After-Sales Service | Chassis Warranty Only (1 Year) | Chassis Warranty (1 Year) + Superstructure Warranty (2 Years) | Nationwide Dongfeng Chassis Warranty + Lifetime Superstructure Warranty III. Configuration Differences and Core Selection Rationale As shown above, all three vehicles are built on 3308-wheelbase chassis, yet configurations differ markedly: • Cold-Start Capability: Supplier C (Chengli Direct Sales) equips low-temperature batteries, antifreeze, heaters, and a dedicated cold-start module—ensuring reliable engine starts down to -25°C; Supplier B provides only a heater, while Supplier A offers no special cold-weather provisions—posing operational risks during Yinchuan winters. • Hydraulic System: Chengli employs -40°C-rated hydraulic oil, insulated hydraulic lines, and hydraulic preheating—ensuring consistent performance and leak-free operation even in extreme cold.