The invention provides an engine assembly and a vehicle with the engine assembly. The engine assembly comprises an engine body, an oil storage device and an on-off device. The engine body comprises anair cylinder body, and an air cylinder body main oil way is formed in the air cylinder body. The oil storage device is connected with the air cylinder body main oil way and used for outputting lubricating oil into the air cylinder body main oil way. The on-off device is arranged to be used for communicating or cutting off the oil storage device and the air cylinder body main oil way. According tothe engine assembly, quick building of an oil film during engine cold starting can be achieved, friction during engine cold starting and frequent starting is reduced, and therefore the service life of engine parts is prolonged.