Weichai Power Co. Ltd. is mainly engaged in R&D and the manufacture and sale of diesel combustion engines. It is the only listed diesel engine manufacturer in mainland China. Its products are extensively used in heavy-duty vehicles, buses, engineering machinery and boats.

Located in Weifang, Shandong Province, the company's WD615 series and WD618 series diesel engines command a 75% market share in the domestic heavy-duty vehicle market and in the engineering machinery market. Its 10/12L high-power diesel engines have for many years been well accepted in the market. Weichai Power holds ISO9000 and ISO/TS16949 system quality certifications.