I. Case Background: Procurement Requirements of a Municipal Sanitation Department in Beijing In winter 2025, a municipal sanitation department in Beijing publicly tendered for a batch of new Dongfeng sewage treatment vehicles to address growing sewage treatment demands. The project budget was capped at approximately RMB 2.272 million, with plans to procure four units at an estimated unit price of around RMB 500,000 (per publicly available tender information). After multiple rounds of evaluation, the proposal submitted by Chengli Special Purpose Vehicle Co., Ltd. stood out, resulting in the delivery of four CLW5180GSSD6-type sewage treatment vehicles—customized on Dongfeng chassis. These vehicles are primarily deployed for emergency sewage network maintenance in urban areas, floodwater pumping in low-lying zones, and preliminary industrial wastewater purification—particularly requiring reliable performance under Beijing’s harsh winter conditions. This article shares real-world user experience, operational details, and winter maintenance tips from the perspective of actual drivers. II. Driver Perspective: From 'Difficult to Drive' to 'Effortless to Operate' Upon receiving these vehicles, several veteran drivers remarked, “This vehicle is easier to drive than we expected.” It features smooth acceleration, light steering effort, and excellent visibility—even though it is a yellow-plate vehicle. A driver with 10 years’ experience commented: “With our older sewage treatment vehicles, starting the engine in winter felt like pampering an elder—now this new Dongfeng model starts instantly upon turning the key. Much less hassle!” During continuous operation testing, the vehicle demonstrated outstanding hill-climbing and cornering stability when fully loaded (approx. 12 tons of sewage). Its chassis tuning prioritizes ride comfort, reducing driver fatigue during extended shifts. The hydraulic system operated smoothly even at -10°C, without the common issue of hydraulic oil solidification causing sluggish or jammed actuator response. Operational Convenience: Easy Handling Even for C-License Drivers Although the vehicle’s gross vehicle weight is approx. 18 tons (requiring a yellow license plate), its cab design is highly driver-centric: equipped with a multifunction steering wheel, power windows, climate-controlled air conditioning, and rearview camera. A young driver holding a Class C license for only two years reported after test-driving: “Other than its longer body length, driving it feels almost identical to operating an automatic SUV—just need extra caution for blind spots when reversing.” In fact, per the FAQ section in our knowledge base, yellow-plate sewage treatment vehicles require a Class B2 driver’s license; however, certain blue-plate models (e.g., CLW5070GSSD6) can be legally operated with just a Class C license. The sewage pump control panel features bilingual (Chinese–English) labeling. New drivers can master basic operations within 30 minutes after reading the manual. Hydraulic outriggers deploy automatically with a single button press—eliminating time-consuming manual setup and significantly improving efficiency during emergency repairs. III. Key Regional Considerations for Beijing: Cold-Weather Starting & Low-Temperature Hydraulic Stability Beijing’s winter temperatures frequently drop below -15°C—posing severe challenges to vehicle starting capability and hydraulic system reliability. The vehicles delivered by Chengli were equipped as standard with antifreeze-rated batteries and an engine preheating system. Field tests confirmed successful engine startup at -20°C: after engaging the ‘preheat’ position for 30 seconds, the engine started reliably—without battery discharge or starter motor weakness. Regarding low-temperature hydraulic stability, the vehicles utilize cold-resistant hydraulic oil (ISO VG 46), combined with integrated hydraulic line heating. Even during extreme cold snaps and prolonged continuous operation,