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Don't worry about using it, as far as I know it is good indefinitely in the container whether its been opened or not but you can also test it with the tester. It degrades over time when in the car cooling system by engine heat probably the worse with driving in high heat climates where...

Yes its good, you can also test it for the level of the freeze protection with coolant/antifreeze tester, the small glass tube with balls in and a rubber suction bulb at top allows small amt of fluid and number of balls sinking or floating tells freeze level protection. If its not diluted 50/50...

Surprised to see relatively new Prestone Platinum premium 15 yr life coolant turned clear. After doing a flush and refill of cooling system I had about a pint left over in a 1 liter clear plastic bottle on passenger seat exposed to the sunlight. In about 10 days to 2 weeks the antifreeze turned...