antifreeze rating

Fresh antifreeze does have acidity buffers, acts as a lubricant, has anti foaming agents ect.... Toyota use long life coolant in your car which should be good for 100000 miles. Cooling systems only get acidic if the head gasket is leaking. I think they meant to say it was their opinion the antifreeze was "dirty" not acidic. Acidic test is using Ph paper or doing a "block check" which looks for the presence of CO in the cooling system.