had bad experience with guard coolant red one, its not good quality, caused my heater core to leak because of harsh cheap chemicals in it though it could also be because i guess the mechanic also mess-up up the dilution ratios, its not pre diluted, what do you expect from product of this price, if you can afford better ones than don't even think about this one, buying a coolant is much cheaper than head gasket or heater core repair etc