Kia Soul 2022 Owner's Manual page 456

Maintenance
Do not use alcohol or methanol
coolant or mix them with the
specified coolant.
Do not use a solution that con -
tains more than 60% antifreeze
or less than 35% antifreeze,
which would reduce the effective -
ness of the solution.
The cooling circuit of a vehicle
equipped with a heat pump sys -
tem may freeze in extremely low
temperature when the concen -
tration of the antifreezing liquid is
below 45%.
For mixture percentage, refer to the
following table.
Mixture Percentage (volume)
Ambient Tem -
perature
Antifreeze
5 F (-15 C)
-13 F (-25 C)
-31 F (-35 C)
-49 F (-45 C)
7 24
Water
35 65
40 60
50 50
60 40
WARNING
Radiator cap
Do not remove the radiator cap
when the engine and radiator are
hot. Scalding hot coolant and steam
may blow out under pressure which
may result in serious injury.
NOTICE
Make sure the coolant cap is prop -
erly closed after refill or coolant.
Otherwise the engine could be over -
heated while driving.
Engine coolant
OSK3078004NR