I hate to burst your bubble boys but I got off the phone with Castrol USA and was told that Castrol NA is producing the 0w30 grade in the U.S. It's supposed to be the same spec. as the German made except for the color. Where is all this oil going to? All new bottles still say "Made in Germany". I bet they are using the same bottles and labels. If this is the case, then you can kiss your GC goodbye.