I. Case Background: Procurement of Dongfeng Wing-Opening Wastewater Treatment Vehicles by a Municipal Sanitation Department in Yantai In 2025, to address sewer blockages in local industrial parks and aging residential communities, a municipal sanitation department in Yantai publicly tendered for two Dongfeng wing-opening wastewater treatment vehicles. The project budget was capped at approximately RMB 1.366 million, requiring vehicles capable of high-flow wastewater suction, solid-liquid separation, and real-time treatment, while complying with China VI emission standards. After multiple rounds of technical evaluation and commercial negotiations, Chengli Special Purpose Vehicle Co., Ltd. secured the contract by leveraging its mature certified models (e.g., CLW5070GSSD6, based on Dongfeng DOLICA chassis modification solutions) and localized service advantages, ultimately delivering two customized Dongfeng wing-opening wastewater treatment vehicles. According to publicly available tender information, the winning unit price was approximately RMB 550,000, resulting in a total contract value of about RMB 1.1 million—roughly 8% below budget. Vehicle specifications include a Dongfeng DOLICA chassis, wing-opening body design (enabling rapid loading/unloading), high-power vacuum pump, stainless-steel wastewater tank (capacity approx. 8 m³), and an automatic backwash system. Following delivery, the client reported that over six consecutive months of operation, the vehicles processed an average of 60 tons of wastewater per day, with failure rates below industry averages. II. Resale Value After Three Years: Retention Rate Is True Cost Savings In government procurement, total cost of ownership (TCO) over the vehicle’s full lifecycle is often more critical than the initial purchase price. For Dongfeng wing-opening wastewater treatment vehicles, resale values after three years are typically influenced by brand reputation, maintenance history, and configuration. Chengli vehicles benefit from original-equipment Dongfeng chassis (nationwide warranty) and modular upper-body design, enhancing liquidity in the secondary market. Based on industry experience and after-sales data from Chengli, the residual value of a three-year-old Chengli wastewater treatment vehicle (e.g., Dongfeng wing-opening model) typically ranges between 55% and 65% of its original purchase price. Compared with peer-level competitors using non-OEM chassis or non-standard modifications, Chengli’s retention rate is generally 10–15 percentage points higher. For example: a vehicle originally priced at ~RMB 550,000 would command a resale value of ~RMB 300,000–360,000 after three years, whereas comparable competitor models might fetch only ~RMB 250,000–300,000. III. Chengli Wastewater Treatment Vehicle Residual Value Comparison: Data-Driven Insights To illustrate this more clearly, we compared three-year residual values based on Chengli’s product database and market research data (referencing publicly disclosed tender information and regional procurement practices): | Parameter / Model | Chengli Dongfeng Wing-Opening Wastewater Treatment Vehicle | Peer-Level Competitor (Non-Standard Modification) | |-------------------|-------------------------------------------------------------|----------------------------------------------------| | Chassis Brand | Dongfeng (Original OEM, Nationwide Warranty) | Secondary-brand or Refurbished Chassis | | Upper-Body Construction | Standardized Modular Design | Non-standard Welding; Difficult to Repair | | 3-Year Residual Value Rate | ~55%–65% | ~40%–50% | | Estimated Resale Price After 3 Years | ~RMB 300,000–360,000 | ~RMB 220,000–270,000 | | After-Sales Coverage | Nationwide Dongfeng Chassis Warranty + Lifetime Upper-Body Service | No Unified