When to change a Timing Chain on a BMW Z3?

The timing chain on a BMW Z3 typically does not require regular replacement like a timing belt, as it is designed to last the lifetime of the engine. However, it should be inspected if you notice signs of unusual noise from the engine or if there are issues with engine performance. Additionally, if the vehicle has high mileage (generally over 100,000 miles) and you are experiencing related symptoms, it may be prudent to have it checked by a professional. Always consult your owner's manual and follow manufacturer recommendations for maintenance.