Overheating at High Speed (revs) and uphill

[EVO-V]

definitely, iikli ang period of effectivity nya..... pero again, you have to change coolant every year.
ang magiging effect lang nya are:

a) proper mixture of coolant and water (1:1 rate), gives you a higher boiling point compared to lets say 80% water and 20% coolant.
b) using coolant minimizes risk of radiator corrosion and formation of rust.

a) 1:1 That also gives you lower coolant thermal conductivity. 30-70 is fine in most cases.
b) Can't amen enough to this.