2006 Lexus GS 300 Owners Manual - Page 564

CHASSIS The recommended cold tire inflation pressure, tire size and the combined weight of occupants and cargo (vehicle capacity weight) are described on the tire and loading information label. You should check the tire inflation pressure every two weeks, or at least once a month. And do not forget the spare! The inflation pressure for the spare tire should be 420 kPa (4.3 kgf/cm2, 4.2 bar, 60 psi). The following instructions for checking tire inflation pressure should be observed: D 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 inflation pressure reading. D Always use a tire pressure gauge. The appearance of the tire can be misleading. Besides, tire inflation pressures that are even just a few pounds off can degrade ride and handling. D Do not bleed or reduce tire inflation pressure after driving. It is normal for the tire inflation pressure to be higher after driving. D Never exceed the vehicle capacity weight. Passengers and luggage weight should be located so that the vehicle is balanced. " 1 Tire valve 2 Tire pressure gauge 1. Remove the tire valve cap. 2. Press the tip of the tire pressure gauge to the tire valve. 3. Read the pressure using the graduations of the gauge. 4. In case the tire inflation pressure is not within the prescribed range, insert the compressed air from the valve. In case of applying too much air, press the center of the valve and release the air to adjust. 5. After completing the tire inflation pressure measurement and adjustment, apply soapy water to the valve and check for leakage. Inspection and adjustment procedure G63001 540