Mazda 2002 B2300 Owner's Manual page 246

Maintenance and Specifications
A 50/50 mixture of distilled water and Mazda Genuine Engine Coolant
provides:
maximum cooling system efficiency.
freeze protection down to -36° C (-34° F).
boiling protection up to 129° C (265° F).
protection against rust and other forms of corrosion.
an accurate temperature readout from the engine coolant
gauge.
The engine coolant must be maintained at the correct fluid level
and concentration to work properly. If the engine coolant fluid
level and concentration is not maintained correctly, damage to
the engine and cooling system may result.
2.3L engine
3.0L & 4.0L engines
When the engine is cold, check the level of the engine coolant in the
reservoir.
246