Two hour life after you break the seal on the bag. The plastic bottle dose not stop moisture. You never want to buy POE ( ester oil ) in a plastic container . Oh buy the way this 3.5 oz is $78.00 your ND-11 DENSO oil is the same. DO not leave the cap off the can for and time other the time it takes to pour. If you have dry nitrogen charge so into your can to displace the air and moisture that have entered as you poured .