Case Background: Emergency Service Requirements at High Altitude. In winter 2024, a municipal sanitation department in Lhasa launched a procurement project for 'Ford Transit V362 service vehicles' to support road inspection, emergency repairs, and material transportation in remote areas. Located on the Qinghai-Tibet Plateau, Lhasa sits at an altitude exceeding 3,600 meters, with winter temperatures dropping below -20°C and large diurnal temperature fluctuations—posing stringent requirements on vehicle cold-start performance, hydraulic system stability, and winter maintenance. After comprehensive evaluation and open tendering, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') provided a customized solution and delivered five units of the Ford Transit V362 service vehicles. These vehicles are now operational in Lhasa, and customer feedback confirms stable performance under high-altitude, low-temperature conditions, effectively supporting daily operations. Core Winter Operational Challenges and Chengli’s Solutions 1. Cold-Start Performance: Reliable Engine Ignition at -20°C Lhasa frequently experiences extreme cold during winter; conventional diesel vehicles often suffer from fuel line gelling and battery discharge, resulting in failure to start. To address this, Chengli implemented targeted modifications to the Ford Transit V362 service vehicles: • Installed a low-temperature preheating system: incorporating engine intake preheating and fuel heating devices to ensure smooth starting at -25°C. This configuration has passed high-cold climate testing, as verified by the official announcement for Chengli CLW5030XJH6 service vehicle (MIIT Announcement). • Upgraded battery and starter motor: equipped with high-capacity, low-temperature batteries (~100Ah) and reinforced starter motors to enhance cranking torque in sub-zero conditions. • Recommended use of low-pour-point diesel: advised customers to select -35 grade diesel according to ambient temperature, and integrated diesel filter heating functionality to prevent wax-induced clogging. In post-delivery field tests conducted at approximately -15°C in Lhasa, all vehicles started successfully within one minute—customers remarked, “Cold-start performance far exceeded expectations.” 2. Hydraulic System Stability: Preventing Hydraulic Fluid Solidification at Low Temperatures Service vehicles commonly feature hydraulic components such as lifting platforms and tool cabinets; increased hydraulic fluid viscosity at low temperatures may cause sluggish response or system damage. Chengli’s solution includes: • Low-temperature hydraulic oil: HV-grade hydraulic oil with a pour point as low as -30°C, ensuring excellent fluidity under freezing conditions. • Hydraulic line insulation: installed thermal insulation sleeves to minimize heat loss and optimized piping layout to eliminate dead zones. • Preheating recommendations: advised operators to idle the vehicle for 5–10 minutes after startup before engaging hydraulic functions, avoiding cold-state overload. According to feedback from the procuring entity, no instances of hydraulic system jamming or leakage occurred during continuous winter operation. 3. Winter Maintenance Plan: Specialized Servicing for the Plateau Environment Lhasa’s thin air and high dust levels necessitate tailored winter maintenance practices. Upon delivery, Chengli provided a detailed winter maintenance manual and committed to lifelong after-sales service: • Coolant & Antifreeze: Recommended use of -35°C antifreeze, with regular concentration checks. • Engine Oil Selection: Recommended 0W-40 full-synthetic engine oil to ensure optimal low-temperature fluidity and sufficient high-temperature protection. • Chassis & Drivetrain: Lubricating grease inspection every 5,000 km to prevent low-temperature hardening...