Whats the truth behind this oil over the green? I hear many swear by the green and not the gold...and some say the gold is the predecessor of the green...who am I to believe? I need some answers quick cuz the autozone chain is doing the $3.99 special for GC...I might wanna stock up before this sale is over...Right now I wiped out my whole area clean of GREEN GC....but many other stores still have the GOLD GC just chillen...should I pick it up?