In Northeast China, severe winter cold imposes stringent requirements on anti-freezing engine start-up and hydraulic system stability for special-purpose vehicles. For example, a municipal sanitation department in Anshan recently procured a batch of National VI Dongfeng sewage treatment vehicles with a 3308 mm wheelbase via public tender, for urban sewer network cleaning, sedimentation tank unclogging, and emergency sewage discharge operations. This article analyzes the procurement solution from four perspectives—functional configuration, value of optional equipment, Chengli’s transparent pricing logic, and common user concerns—to serve as a reference for users in the same region. I. Standard vs. Premium Configuration List According to MIIT announcement parameters (e.g., model CLW5070GSSD6), the Dongfeng 3308 mm wheelbase chassis can accommodate sewage treatment vehicles with tank capacities ranging from 3 to 8 m³. Given Anshan’s typical winter temperatures frequently dropping below -20°C, the purchaser made targeted selections between standard and premium versions. Below is a representative configuration comparison (based on publicly available tender information): Configuration Item Standard Version (Budget: ~¥257,000–¥279,000) Premium Version (Budget: ~¥302,000–¥335,000) Chassis Model Dongfeng 3308 mm wheelbase, National VI emission standard Dongfeng 3308 mm wheelbase, National VI emission standard Engine Yuchai 140 hp, standard diesel Yuchai 160 hp, equipped with preheating device Hydraulic System Standard hydraulic pump, no heating Low-temperature hydraulic oil + hydraulic line heating kit Sewage Tank 4 m³ carbon steel tank, standard corrosion protection 5 m³ stainless steel tank, enhanced corrosion protection Vacuum Pump Water-ring vacuum pump Vane-type vacuum pump with freeze-resistant exhaust valve Anti-freezing Start-up System Battery preheating (optional) Engine jacket heater + battery insulation Winter Maintenance Plan Basic maintenance checklist Includes antifreeze replacement, hydraulic oil testing, and pipeline insulation In this case, the premium version was ultimately selected, because prolonged sub-zero temperatures in Anshan—especially below -25°C—can cause standard hydraulic oil to solidify and vacuum pumps to crack. The premium version’s added engine preheating device and hydraulic line heating kit have been field-tested to ensure reliable start-up at -30°C, improving hydraulic system response speed by approximately 40%. II. Value Analysis of Optional Equipment In this procurement, an environmental maintenance unit of a subdistrict in Anshan selected three core optional configurations, delivering value as follows: 1. Engine Jacket Heater (Optional Price: ~¥8,000) This device heats the engine coolant via external power supply, raising the engine oil temperature above 10°C prior to start-up, thereby minimizing wear caused by cold starts. In Northeast China, this configuration reduces average winter start-up time from 15 minutes to 3 minutes and saves approximately 2 liters of fuel per day. Assuming annual operation of 200 days per vehicle, the investment pays back in roughly two years. 2. Low-Temperature Hydraulic Oil + Hydraulic Line Heating Kit (Optional Price: ~¥6,000) Standard hydraulic oil exhibits sharply increased viscosity below -15°C, causing suction difficulties for hydraulic pumps. Low-temperature hydraulic oil (pour point: -40°C), combined with the heating kit, ensures normal hydraulic circulation even at -30°C. This configuration eliminates the risk of hydraulic pump dry-running damage—repair costs for which average ¥5,000 per incident—and indirectly safeguards operational efficiency. 3. Stainless Steel Sewage Tank (Optional Price: ~¥12,000) Carbon steel tanks in