Extending your BMW life and improving its performance

General overall cleanliness of your engine is the best preventive maintenance you can perform on your BMW. A clean engine runs cooler and is much less likely to cause premature failure of other parts. It's also easier to work on. Regular routine replacement of all filters, lubricants, coolant and the other parts noted here is critical. Use the mileage guidelines shown as your benchmark. Sensing and mechanical tolerances have become so tight even slight variations can create drastic performance changes. Remember that some improvements may not take effect right away if your BMW's computer is designed to learn and adjust. The computer may need to see various parameters before making any permanent setting changes.