Diesel engines in the domestic Chinese market are mainly applied in sectors including commercial vehicles, construction machinery, agricultural machinery, and power generation. In recent years, the market has demonstrated the following characteristics:

China’s domestic diesel engine sales reached 5.1165 million units in 2023, a year‑on‑year increase of 10.54%. Affected by macroeconomic fluctuations in 2024, sales dropped to 4.931 million units, representing a 3.7% year‑on‑year decline. From January to October 2025, cumulative sales hit 4.226 million units, up 5.9% year‑on‑year, marking a gradual market recovery.

Multi‑cylinder diesel engines constitute the mainstream product category, accounting for over 80% of total sales from January to October 2025, while single‑cylinder diesel engines make up approximately 20%.

The market features a high degree of concentration, with leading enterprises holding prominent competitive advantages. Between January and October 2025, the top‑10 manufacturers including Weichai, Yuchai and Yunnei contributed 78.26% of total multi‑cylinder diesel engine sales. Weichai ranked first with a 18.98% market share.

Competition is particularly fierce in the commercial‑vehicle segment. Weichai holds more than 21% market share in multi‑cylinder diesel engines for commercial vehicles, followed closely by players such as Yuchai and Jiangling Motors.

Leading manufacturers keep pushing the boundaries of thermal efficiency. For instance, Weichai has launched diesel engines with thermal efficiency exceeding 50%, driving the industry toward higher efficiency and lower emissions.

Intelligent technologies are being progressively adopted. Electronic control systems are deployed to optimize combustion processes, improving fuel economy and operational reliability.

The enforcement of China’s National‑VI emission standard has accelerated the phasing‑out of outdated diesel engines and forced enterprises to upgrade their technologies.

The trade‑in incentive policy has stimulated market demand, especially within the commercial‑vehicle and construction‑machinery sectors.

New‑energy solutions such as battery‑electric and hydrogen fuel‑cell powertrains are replacing diesel engines in certain application scenarios. Nevertheless, diesel engines still retain distinct advantages for heavy‑duty operations and long‑haul transportation.

Overall, driven by policy guidance and technological upgrades, the domestic diesel‑engine market is evolving toward higher efficiency, environmental friendliness and greater intelligence. Through technological innovation and market consolidation, major market participants have further consolidated their market positions.