The BYD DM-i super hybrid system is known for its mature and reliable technology, a key reason the Tang DM-i ranks among the best used cars for buyers seeking long-term dependability. Owners report low mechanical failure rates, and routine maintenance cost is highly affordable: basic services every 10,000 km (6,214 miles) cost approximately $150-$200, including oil changes, filter replacements, and system inspections. Key inspection items include engine mounts, brake components, and battery health checks, all with low repair costs when serviced regularly at authorized used car dealerships or service centers. A well-maintained Tang DM-i can easily exceed 200,000 km (124,274 miles) while maintaining stable performance, making it worth buying for anyone prioritizing reliability and low upkeep expenses.