I. Project Background: Procurement Decision by a Municipal Sanitation Department in Nanchong In 2024, a municipal sanitation department in Nanchong planned to procure a batch of blue license plate sewage treatment vehicles for urban pipeline dredging, septic tank cleaning, and emergency sewage discharge operations. After multiple rounds of tendering and on-site inspections, the department ultimately selected the Chengli sewage treatment vehicle built on the Dongfeng D6 chassis (reference announcement model CLW5070GSSD6). A total of three units were delivered, with a unit price of approximately RMB 150,000 (in line with local procurement practices, keeping the total budget within RMB 511,000). The procuring party stated that the key reasons for selecting Chengli were: (1) complete official vehicle announcements enabling normal registration and annual inspection; (2) nationwide warranty coverage for the chassis and lifetime service support for the superstructure; and (3) factory-direct sales, saving approximately RMB 8,000–15,000 per unit compared to 4S dealership channels. Currently, these three vehicles have been operating across multiple streets in Nanchong for over six months, with customer feedback highlighting 'stable operation, low fuel consumption, and ease of operation.' II. Total Cost of Ownership (TCO) Analysis by Service Life: 5-Year / 8-Year / 10-Year For government procurement, the vehicle’s total cost of ownership (TCO) over its full lifecycle is a core evaluation criterion. Below is a TCO analysis for the Dongfeng D6 blue license plate sewage treatment vehicle used in the Nanchong project, based on the CLW5070GSSD6 announcement specifications, covering 5-year, 8-year, and 10-year service life scenarios. 1. 5-Year Usage Cost (Short-Term, High-Frequency Operation) If deployed for intensive, high-frequency emergency sewage discharge operations, the vehicle is expected to accumulate 150,000–200,000 km over five years. Key cost components: - Purchase Cost: ~RMB 150,000 (per publicly disclosed tender data). - Fuel Cost: Assuming average fuel consumption of 12 L/100 km and diesel price of RMB 10/L, total fuel cost over five years is ~RMB 135,000. - Maintenance & Repair: Dongfeng chassis covered under nationwide warranty; Chengli superstructure supported by lifetime service. Estimated basic maintenance costs: ~RMB 20,000; major repair costs: ~RMB 15,000 (e.g., high-pressure pump and seal replacement). - Insurance & Taxes: Low tax burden for blue license plate vehicles; ~RMB 20,000 over five years. - Total 5-Year Cost: ~RMB 340,000 (~RMB 68,000/year). 2. 8-Year Usage Cost (Medium-to-Long-Term Stable Operation) If deployed for routine urban pipeline maintenance, the vehicle is expected to accumulate 200,000–250,000 km over eight years. Cost adjustments: - Purchase Cost: Same as above, ~RMB 150,000. - Fuel Cost: ~RMB 180,000. - Maintenance & Repair: Two major repairs required over eight years (RMB 20,000 each); maintenance expenses ~RMB 35,000. Chengli’s lifetime superstructure service helps reduce certain repair costs. - Insurance & Taxes: ~RMB 30,000. - Total 8-Year Cost: ~RMB 415,000 (~RMB 51,900/year). 3. 10-Year Usage Cost (Long-Term, Low-Intensity Operation) If deployed for emergency standby or low-intensity tasks, the vehicle is expected to accumulate ~150,000 km over ten years. Cost breakdown: - Purchase Cost: ~RMB 150,000. - Fuel Cost: ~RMB 135,000. - Maintenance & Repair: Three major repairs required over ten years (~RMB 60,000 total); maintenance expenses ~RMB 40,000. Chengli’s 24-hour direct-shipping spare parts logistics help minimize downtime. - Insurance & Taxes: ~RMB 35,000. - Total 10-Year Cost: ~RMB 420,000 (~RMB 42,000/year). Comparative Cost Summary Table Service Life Purchase Cost