Yung mga anti-freeze na yan eh, galing US/North America. In certain states, esp. Alaska, the weather gets so cold that the water in the radiator freezes solid, kaya may anti-freeze.

Dito naman sa atin, tropical ang klima, kaya di na kailangan. Pero AFAIK, component lang naman ang anti-freeze sa coolant. Hindi naman yata sya sold separately.