How often do I need to change the engine oil on a CB450 / CL450 / CB500T? December 17, 2018 05:09 Every 1,500 miles / 2,400 km. Related articles What engine oil should I use for my CB450 / CL450 / CB500T? How much engine oil do I need for my CB450 / CL450 / CB500T? What is the valve adjustment / tappet clearance specs for the Honda CB450 / CL450 / CB500T? What spark plug do I need for my CB450 / CL450 / CB500T? How to change the oil on the Honda CB450 / CL450 / CB500T