Kia Optima Hybrid 2017 Owner's Manual page 597

Maintenance
CAUTION
• Warm tires normally exceed rec‐
ommended cold tire pressures by
28 to 41 kPa (4 to 6 psi). Do not
release air from warm tires to ad‐
just the pressure or the tires will
be underinflated.
• Be sure to reinstall the tire infla‐
tion valve caps. Without the valve
cap, dirt or moisture could get into
the valve core and cause air leak‐
age. If a valve cap is missing, in‐
stall a new one as soon as possi‐
ble.
WARNING
n Tire inflation
Overinflation or underinflation can
reduce tire life, adversely affect ve‐
hicle handling, and lead to sudden
tire failure. This could result in loss
of vehicle control and potential in‐
jury.
9-44
CAUTION
n Tire pressure
Always observe the following:
• Check tire pressure when the tires
are cold. (After vehicle has been
parked for at least three hours or
hasn't been driven more than
1.6 km (one mile) since startup.)
• Check the pressure of your spare
tire each time you check the pres‐
sure of other tires.
• Never overload your vehicle. Be
careful not to overload a vehicle
luggage rack if your vehicle is
equipped with one.
• Worn, old tires can cause acci‐
dents. If your tread is badly worn,
or if your tires have been dam‐
aged, replace them.
Checking tire inflation pressure
Check your tires once a month or more.
Also, check the tire pressure of the
spare tire.
How to check
Use a good quality gauge to check tire
pressure. You can not tell if your tires
are properly inflated simply by looking
at them. Radial tires may look properly
inflated even when they're underinfla‐
ted.
Check the tire's inflation pressure when
the tires are cold. - "Cold" means your
vehicle has been sitting for at least
three hours or driven no more than
1.6 km (one mile).
Remove the valve cap from the tire
valve stem. Press the tire gauge firmly
onto the valve to get a pressure meas‐
urement. If the cold tire inflation pres‐
sure matches the recommended pres‐
sure on the tire and loading information
label, no further adjustment is necessa‐
ry. If the pressure is low, add air until
you reach the recommended amount.
If you overfill the tire, release air by
pushing on the metal stem in the cen‐
ter of the tire valve. Recheck the tire
pressure with the tire gauge. Be sure to
put the valve caps back on the valve
stems. They help prevent leaks by
keeping out dirt and moisture.