Lexus SC 430 2006 Owner's Manual page 235

4-3. Do-it-yourself maintenance
Tire inflation pressure check interval
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You should check the tire inflation pressure every two weeks, or at least once a
month.
Do not forget to check the air pressure of the spare tire, if so equipped. The inflation
pressure for the compact spare tire should be 60 psi (420 kPa, 4.3 kgf/cm
bar). (P.307)
Effects of incorrect tire inflation pressure
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Driving with incorrect tire inflation pressure may result in the following:
Wasting fuel
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Reducing driving comfort and tire life
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Making your vehicle less safe to drive
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If a tire needs frequent refilling, have it checked by your Lexus dealer.
Instructions for checking tire inflation pressure
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When checking tire inflation pressure, observing the following:
Check 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 mile or 1.5 km since, you will get an accurate cold tire inflation pres-
sure reading.
Always use a tire pressure gauge.
●
The appearance of the tire can be misleading. In addition, tire inflation pressures
that are even just a few pounds off can degrade ride and handling.
Do not bleed or reduce tire inflation pressure after driving.
●
It is normal for the tire inflation pressure to be higher after driving.
Never exceed the vehicle weight capacity.
●
Passengers and luggage weight should be placed so that the vehicle is bal-
anced.
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, 4.2