Government procurement case of Shenyang’s National VI Dongfeng sewage treatment vehicle with 3308 mm wheelbase: A scoring-based winning bid solution analysis. In Shenyang’s winter, sub-zero temperatures down to -20°C are common, posing severe challenges to the operation of municipal sanitation equipment. Recently, a municipal sanitation department publicly tendered for a batch of National VI emission-standard sewage treatment vehicles, with a budget cap of approximately RMB 285,000 per unit. Requirements included high-efficiency sewage treatment capability and adaptability to Northeast China’s harsh cold climate. After multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. secured the contract with its sewage treatment vehicle solution built on the Dongfeng 3308 mm wheelbase chassis, delivering several units now operating stably in local sanitation operations in Shenyang. This article dissects the tender evaluation criteria across three dimensions—technology, commercial terms, and service—to reveal competitive strategies in these areas, with special emphasis on freeze-resistant starting performance, low-temperature hydraulic stability, and winter maintenance plans—the top priorities for procurement authorities in Shenyang. (Based on publicly available tender information, this procurement involves approximately five vehicles, with a total budget capped at around RMB 1.427 million.) I. Tender Evaluation Criteria Breakdown: Technology, Commercial Terms, and Service Account for One-Third Each According to standard municipal procurement practices in Shenyang, the project’s evaluation system is typically divided into three components: Technical Score (50%), Commercial Score (30%), and Service Score (20%). The technical score is the decisive factor differentiating bidders—especially regarding adaptability to Northeast China’s unique climatic conditions. Chengli’s proposal emphasized three key technical indicators: freeze-resistant starting system, low-temperature hydraulic stability, and compliance with official vehicle type approval. The selected model uses the Dongfeng 3308 mm wheelbase chassis equipped with a National VI engine, designated CLW5070GSSD6 (official parameters publicly verifiable). This chassis enjoys an extensive local service network in Shenyang and offers factory-backed nationwide warranty coverage, facilitating subsequent maintenance. II. Maximizing the Technical Score: Freeze-Resistant Starting and Low-Temperature Hydraulic Performance Are Critical Shenyang’s winter temperatures frequently drop below -15°C, causing common operational issues such as difficult vehicle starting and hydraulic system freezing. Chengli’s solution incorporated the following targeted technical enhancements: Freeze-Resistant Starting System: Equipped with a low-temperature starting assistance system—including glow plugs and a cold-start fluid injection system—to ensure reliable single-cycle engine start-up even at -25°C. Per publicly disclosed tender requirements, the ‘engine start time’ criterion explicitly stipulated ‘no more than 30 seconds’. Chengli’s solution achieved measured start times of 15–20 seconds. Low-Temperature Hydraulic Stability: Hydraulic tubing is insulated with thermal protection layers, and ultra-low-temperature hydraulic oil (rated for -30°C) is used to prevent oil gelling and consequent pump damage. The hydraulic system adopts a closed-loop design to minimize heat loss and maintain stable oil temperature during continuous operation. Sewage Treatment Capacity: The onboard treatment unit employs a combined physical and chemical filtration process, achieving a daily treatment capacity of approximately 10 tons per unit—suitable for small-diameter sewer networks and septic tank cleaning applications. The tank is fabricated from high-strength steel plate (4 mm thickness), with corrosion-resistant coating capable of withstanding pH levels between 6 and 9. Type Approval Compliance: This model has b