The oil pump shaft drives the pump to create force within the oil distribution system. This force is important to ensure the lubricating oil moves properly through the engine passages, providing effective lubrication to the engine's moving parts. Use the manufacturer's recommended oil and fill the oil reservoir with the correct amount. Test the engine to verify that the oil pump and shaft are operating correctly without oil leaks. The oil pump shaft allows the oil to flow freely through the engine, transforming every trip into freedom and excitement.