I use Top1 coolant sa isa kong car at 100 petot per can. I use only 1 can but change my coolant every 6 mos.

A 50/50 coolant mixture will only have 50% heat removal compared to 100% pure water. With less 'coolant in the mix' you have more heat removal capacity but for corrosion protection and lubricating properties a more diluted mixture needs to be replaced more often, which I am willing to do.

Radiator cap pressure rating should also be within your car specs or higher for increased boiling point, also to prevent hot spot formation, and pump cavitation.

I also use Shell and Caltex long life at 25% mix sa iba kong sasakyan. Wilkins (or kung ano mura na foodgrade distilled water) ang pinaka tubig ko.