I say the cheapest ,phosphate free coolant, is the one to buy. I have not
yet,in over three years ,kept a load of coolant for more than 6 months.My
current 6 months is due at this time.Stay back!!! I'll keep you posted.I
buy Serria in the green bottle with the dog on the label.$7.99/gallon at
ACE hardware.It is made by PEAK. I called Peak(number is on the bottle),and
they said all their products are phosphate free. I think the Global
antifreeze, by Peak is about $5.99/gallon. I can loose it all day(and
sometimes do) at that price.