Do you use radiator coolant?

[EVO-V]

+1 to ^

May coolant na pre-mixed and ready to use no need to halo (Prestone ata meron sa Ace, some casas also sell them). May coolant din na concentrate that you have to mix with DISTILLED water before using (Prestone again, some gas stations sell their own brands). Know which one you're using.

Be careful with "generic" coolants. Some of those are so diluted you're better off with piss.