1997 Lexus SC 400 Owners Manual - Page 230

CHASSIS High tire pressure produces a harsh ride, handling problems, excessive wear at the center of the tire tread, and a greater possibility of tire damage from road hazards. The following instructions for checking tire pressure should be observed: S The pressure should be checked only when the tires are cold. If your vehicle has been parked for at least 3 hours and has not been driven for more than 1.5 km or 1 mile since, you will get an accurate cold tire pressure reading. ROTATING TIRES S Always use a tire pressure gauge. The appearance of the tire can be misleading. Besides, tire pressures that are even just a few pounds off can degrade handling and ride. To equalize tire wear and help extend tire life, Lexus recommends that you rotate your tires approximately every 12000 km (7500 miles). However, the most appropriate timing for tire rotation may vary according to your driving habits and road surface conditions. The wheel assemblies must be rotated as illustrated above. Tires without turning direction indicators must be rotated as pattern A. For tires with turning direction indicators, use pattern B. When rotating tires, check for uneven wear and damage. Abnormal wear is usually caused by incorrect tire pressure, improper wheel alignment, out-of-balance wheels, or severe braking. Before storing radial, snow or studded tires, mark the direction of rotation and be sure to install them in the same direction when using them again. Tires should be stored in a cool dry place. 221 S Do not bleed or reduce tire pressure after driving. It is normal for the tire pressure to be higher after driving. S Never exceed the vehicle capacity weight. The passengers and luggage weight should be located so that the vehicle is balanced. S Be sure to reinstall the tire valve caps. Without the valve caps, dirt or moisture could get into the valve core and cause air leakage. If the caps have been lost, have new ones put on as soon as possible.