I have never heard of one, but here it goes. Has anyone heard of a shelf life for Stihl brand 2 cycle oil or bar oil. I am going to an auction that will have many gallons of bar oil. And lots of the 1 gal. mix sized bottles of 2 cycle oil. These are not old currently (the guy having the sale is a going out of business tree service) but if I were to score several years worth, I am just wondering if it could get "Old".