When should you change the cam belt on a BMW Z4?

The cam belt on a BMW Z4 should typically be changed every 60,000 to 100,000 miles, depending on the specific engine model and driving conditions. It's essential to consult the owner's manual for the manufacturer's recommendations, as some engines may have different intervals. Additionally, if you notice any signs of wear or damage, such as fraying or cracking, it's wise to replace the belt sooner. Regular maintenance can help prevent serious engine damage.