I called Castrol today. Their webpage has been updated and all grades except the 0w-30 are now GF-4 rated. She said that it won't be GF-4 rated. This is most likely due to the extensive European specifications this oil meets, and also that it's to thick to meet the fuel efficieny requirement of GF-4. I think it's a good thing. You have to wonder if Castrol isn't aware of the success this oil is having in the US. Every auto forum I go to, from Toyota to Honda, someone always mentions German Castrol.