Core Viewpoint - The domestic internal combustion engine market in China is showing positive growth trends, with significant year-on-year increases in sales, driven by favorable macroeconomic policies and rising consumer confidence [1][2][6]. Group 1: Internal Combustion Engine Sales - In July 2025, internal combustion engine sales reached 4.354 million units, marking a month-on-month increase of 4.14% and a year-on-year increase of 14.28%. Cumulative sales from January to July totaled 29.6417 million units, reflecting a year-on-year growth of 12.50% [1]. - The multi-cylinder diesel engine market saw July sales of 139,400 units, a month-on-month decline of 16.71% but a year-on-year increase of 12.84%. Cumulative sales for the first seven months reached 1.1621 million units, with a year-on-year growth of 3.55% [14]. Group 2: Diesel Engine Sales - In July 2025, diesel engine sales amounted to 367,200 units, with a month-on-month decrease of 11.39% but a year-on-year increase of 6.68%. Cumulative sales for the first seven months surpassed 3 million units, achieving a year-on-year growth of 4.45% [2]. - The multi-cylinder diesel engine segment recorded cumulative sales of over 2.4441 million units from January to July, reflecting a year-on-year increase of 4.14% [5]. Group 3: Market Performance of Key Companies - Weichai maintained its leading position in the multi-cylinder diesel engine market with July sales of 53,900 units, achieving a month-on-month growth of 17.13%. Cumulative sales for the first seven months reached 430,400 units, with a market share of 17.61% [10][11]. - Yuchai ranked second with cumulative sales of 352,700 units, showing a significant year-on-year growth of 28.90% and a market share of 14.43% [10]. - Yunnei Power and Anhui Quanchai followed, with cumulative sales of 213,100 units and 209,500 units respectively, both showing positive year-on-year growth [10][11]. Group 4: Commercial Vehicle Market - In July 2025, commercial vehicle production and sales were 298,000 units and 306,000 units respectively, with month-on-month declines of 15.8% and 17.1%, but year-on-year increases of 16.3% and 14.1% [6]. - The multi-cylinder diesel engine market for commercial vehicles saw cumulative sales of 1.1621 million units from January to July, reflecting a year-on-year growth of 3.55% [14].