Quote Originally Posted by slamtaz View Post
if i am to infer from the post of those who say that they only use water (i.e. distilled or not) to top off every two weeks or once a month, it seems that the water in the cooling system reaches a point where it regularly & easily evaporates through the reservoir, thus the frequent top-off..

this imo, should not be the case, because the cooling system is supposed to be able to retain the same amount of fluid within months without topping it off, unless there is a leak somewhere..

i believe that the cooling system was designed in such a way that a certain mix of coolant & water is required to prevent it from evaporating faster than it should (i.e. thus eliminating the need for frequent top-offs) because of the raised boiling temperature of the mixture compared to that of water alone. thereby minimizing cooling system maintenance and improving engine heat dissipation..

iirc, ang experience ko kasi with the cars i've maintained for more than two decades now ay never pa ako nagdagdag ng coolant/water mixture sa reservoir more than once every quarter, sometimes even longer. unless, as i've said above, there was a leak somewhere in the cooling system..

just my :twocents: po
A very good point, I should add.