After reading about GC for the past few weeks I've been stopping by Autozones and clearing them out if they have any gold or green left without ever even having used the oil. So far I'm up to 12 quarts of gold and 2 quarts of green, my local AZ has 4 or 5 quarts of '02 American 0W-30, is this worth anything or am I better off leaving it? The scavenger hunt has been fun so far.