"If you can find the 2004 and older GC 0w-30 it is the best." A fine and well mannered analyst told me this. Now, how do I find it? What does it look like? What numbers or codes should I be looking for? Do the Made in Germany words on the back of the bottle signify that it is the 2004 GC or not? Red label on back and front? Green tint to the oil or amber? Sweet smelling or semi-sweet or putrid? Is there anything that I am forgetting?