English.chinabuses.com: As we know that bus engine is different from the truck engine in environment protection, power efficiency and fuel consumption due to the different driving conditions and purposes. The city bus especially has stricter requirement for the gas emission because of short driving distance, low speed and high frequency of start and brake. Yuchai has well prepared for the bus engine market. The bus engine produced by Yuchai has many advantages such as low oil consumption, high ratio of performance and price, strong power, high quality, low emission, low noise, and good service.

After 2 years of development, Yuchai Machine has the strong ability on controlling emission to protect environment. Because of the World Expo in 2010, Shanghai implements the Europe-4 standard. Huanghai bus and Xiamen King Long bus with the Cummins Europe-4 engines were already on the market.

Yuchai adopted the German Benz technology, which is more mature and has been tested by the market for 3 years and its Europe-4 engine also mainly adopts the SCR (selective catalytic reduction) resolution that is more suitable for the domestic market because the sulphur content is too high in the fuel. Yuchai, as the main enterprise of internal combustion engine, strongly expressed the tone of "king of power, and pioneer of environment protection".