I. From 'Frozen Solid' to 'Unfreeze-Proof': Two Procurement Choices by Urumqi Municipal Sanitation Department Urumqi experiences winter temperatures frequently below -20°C, imposing stringent requirements on special-purpose vehicles’ cold-start performance and low-temperature hydraulic system stability. A municipal sanitation department (hereinafter referred to as 'Party A') initially procured three CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicles in 2023 for emergency urban sewer network operations. However, the first batch exposed critical shortcomings during that winter: at -25°C in the early morning, engines failed to start, and hydraulic oil solidified, causing pump seizure—completely disrupting operations. This experience led Party A, when upgrading procurement in 2025, to firmly select Chengli Special Purpose Vehicle Co., Ltd.’s CLW5070GSSD6 model. This article, based on a real government procurement case, details the iterative demand evolution, comparative performance outcomes, and provides FAQs addressing procurement considerations for high-cold regions. First Procurement Experience: Lessons Learned from Budget-Driven Decisions In 2023, Party A conducted an open tender and purchased three CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicles from a certain brand at approximately RMB 80,000 per unit (based on publicly available tender information), intended for emergency urban sewer network operations. Initial acceptance testing passed normally; however, in December of that year, Urumqi experienced prolonged extreme cold, resulting in the following issues: • Cold-Start Failure: After being parked for eight hours at -25°C, vehicle batteries became depleted and diesel fuel waxed, preventing engine startup. Party A was forced to use a blowtorch to heat the oil pan—requiring two hours to barely start one vehicle. • Poor Low-Temperature Hydraulic Stability: The hydraulic pump generated sharp noise under low temperatures; increased hydraulic oil viscosity caused frequent motor overload protection trips in the sewage pump, reducing actual operational efficiency by approximately 40%. • Absence of Winter Maintenance Solutions: The supplier did not provide specialized antifreeze coolant, low-pour-point hydraulic oil, or heating devices. Even after Party A independently replaced fluids, the problems persisted. Ultimately, fleet availability dropped to only 30% in January 2024, compelling Party A to suspend operations and reassess its procurement strategy. Identifying Deficiencies: Core Pain Points in High-Cold Environments Through analysis, Party A identified three core requirements: • Cold-Start Performance: Vehicles must be equipped with low-temperature auxiliary starting systems (e.g., fuel heaters, battery insulation covers) to ensure reliable engine start-up within 15 minutes at -30°C. • Low-Temperature Hydraulic Stability: The hydraulic system must utilize cold-resistant seals and low-pour-point hydraulic oil (pour point below -35°C), plus integrated hydraulic oil preheating functionality. • Winter Maintenance Support: Suppliers must provide a comprehensive winter operation manual covering antifreeze selection, battery maintenance, and oil change intervals. Additionally, Party A explicitly required full compliance with China VI emission standards and complete official vehicle type approval documentation (referencing parameters of models such as CLW5070GSSD6 in the knowledge base). II. Enhanced Requirements: Why Party A Chose Chengli Special Purpose Vehicle Again In March 2025, Party A launched its second procurement round, with a target unit price range of approximately RMB 135,000–169,000 (in line with local procurement conventions). After thorough comparative evaluation, Party A selected Chengli Special Purpose Vehicle Co., Ltd.’s CLW5070GSSD6 model—built on the Dongfeng 3308 mm wheelbase chassis, with superstructure designed and manufactured in-house by Chengli.