Here are the lot #'s on the bottom of the bottles so you can tell you are getting the green and no the gold gc: M02xxxxxxx, M03xxxxxx, M04xxxxx, and M0501xxxxx. Anything after that is the gold gc. Not that the gold is not good, just everyone seems to prefer the green.
quote: You want to check the batch code on the bottom of the bottle. Known good batch numbers for GC green are from M02xxxxxxx, M03xxxxxx, M04xxxxx, and M0501xxxxx. Early M02 are US made and have 0w30 labels that are black letters on a yellow background. Avoid those. On the good ones, 0w30 label should be red background with black letters. They should have "Made in Germany" on the back label. Batch numbers M0502xxxxx and later are Gold color and the jury is still out as to whether it is as good as the green. There are some post in this topic that has more specific batch numbers. Here's a link to what the bottle and oil looks like.