Radiator coolant

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I'm still using the stock toyota long life coolant. During my last pms sa casa, I saw the mechanic topping off the reservoir with tap water from half level, tanong ko lang sir kung kelangan na palitan yung coolant kasi compromised na sya.

PMS sa casa tapos tap water ang nilagay? san yan? anong dealer?

Sa TMBC they top it up with the long life coolant pa din.