2003 Mercedes ML-Class Owner's Manual - Page 210

Operation Tires and wheels ! When the wheels are heavily soiled, e.g. after driving through mud, clean the inside of the wheels with a jet of water. Life of tire The service life of a tire is dependent upon varying factors including but not limited to: Driving style Tire pressure Distance driven Warning! Direction of rotation Unidirectional tires offer added advantages, such as better hydroplaning performance. To benefit, however, you must ensure that the tires rotate in the direction specified. An arrow on the sidewall indicates the intended direction of rotation of the tire. G Tires and spare tire should be replaced after six years, regardless of the remaining tread. ! Keep unmounted tires in a cool, dry place with as little exposure to light as possible. Protect tires from contact with oil, grease and gasoline. 210