For this popular Chinese hybrid car, routine maintenance cost is similar to compact fuel SUVs, averaging $300-$400 per year for basic services like oil changes and filter replacements. The high-voltage battery comes with an original 6-year/150,000 km warranty, which adds significant value for used car buyers and boosts its used car values. In terms of residual value, the 2021 Song PLUS DM-i 51KM retains approximately 55-60% of its original MSRP (around $13,000-$14,200) after 3 years, outperforming many competing plug-in hybrid SUVs due to its exceptional fuel efficiency and practicality. This strong retention makes it a smart choice if you’re looking to buy used cars that hold their value well.