High-speed engines such as WP4, WP6, WD10, WD12, WP12 and M26 are mainly used in high-speed ships and yachts, passenger ships, fishing vessels and official ships in the offshore market as main engines or auxiliary engines. Medium-speed engines 160 and 170 are mainly used in transportation vehicles, engineering ships, passenger ships, as main engines or auxiliary engines. CW200 and 250 are medium speed engines, mainly used in engineering ships, passenger ships, fishing vessels and bulk carriers, as the main engine or auxiliary engine. MAN engines L16/24, L21/31, L27/38, L32/40 and V32/40 are mainly used for bulk carriers, engineering ships and multi-purpose ships and marine traffic control ships as main engines, electric propulsion engines or auxiliary engines . In the Weichai engine model, C represents the marine propulsion engine,