I got a new BMW Z4. I read and listened to all the BMW oil mis-information saying that only BMW Full Synthetic motor oil made by Castrol had to be used or the motor will immediately fail. So, I bought a case of the specified BMW oil (5W30) from the dealer at $5 a quart (seemed reasonable). Says on the box and bottles "High Performance Full Synthetic BMW Motor Oil" and "Meets the requirements of API SL/CF; ACEA A3/B3." It doesn't say it is CERTIFIED to meet these specs, says nothing about being BMW LL01/04 approved as the owners manual states it must and does not have the API starburst. Now I look at my favorite oil bottle - Amsoil 5W40. Says it meets SL, CI-4, CF, ACEA A3, B3, B4 and BMW LL01/98. I know the Amsoil isn't CERTIFIED either, and a real performer. Why in the heck would I ever use the BMW Castrol product, which is a Group 3 product over the Amsoil product, which is PAO based (or for that matter Mobil 1 0W40) and both cost the same? Looks like BMW is full of it, and I'm going to contact their headquarters for a WRITTEN note that says I can use BMW's product that DOES NOT follow the recommendations printed in the service manual provided with the car. I'll keep you posted!