2004 Mercedes ML-Class Owner's Manual - Page 227

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! ! 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. 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. Checking tire inflation pressure Warning! If the tire pressure drops repeatedly: G Check the tires for punctures from foreign objects. Check to see whether air is leaking from the valves or from around the rim. Correct the tire pressure only when tires are cold. Regularly check your tire pressure at intervals of no more than 14 days. If the tires are warm, you should only correct the tire pressure if it is too low for current operating conditions. A table on the fuel filler flap lists the specified tire inflation pressures for warm and cold tires as well as for various operating conditions. G Tires and spare tire should be replaced after six years, regardless of the remaining tread. 227