WD-40 should continue to perform as expected for an almost indefinite period of time. However, actual performance is affected by the longevity of mechanical items such as the valve assembly on aerosol cans. As such, the shelf life is considered to be 5 years from the date of production; however, product will often dispense and perform as expected for considerably longer. WD-40 should be stored between 4 degrees centigrade and 54 degrees centigrade, and always shaken before use.