oo, coolant.
it has higher boiling point than water.
it avoids radiator contamination and degradation.
avoids also radiator rust.
if you are new to coolants, better use the pre-mixed solution. direchong buhos sa radiator. Prestone is good.
note that if you would want to use a coolant now and was not using before, kailangan i drain lahat ang laman ng radiator.





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