I was on Castrol's German website and found the Castrol Formula RS 0W-40. I hear people saying the GC around here is closer to a 40W. I can't help buy wonder if it's the same stuff. Here's the link http://www.castrol.com/castrol/productdetailmin.do?categoryId=82916345&contentId=6004582 Why would they make two different forumlas? I don't see why they sell CG in the US anyway.. Why does Castrol do it? it's not like they market with the intention of people going through the rows looking for the ones made in Germany. Wouldn't it just be cheaper for them to sell all US made Syntec?