HRC - thank you for your reply. I appreciate your comments, but to say that BMW has designed the engine to run on synthetic oil without data as to how, concerns me. The rings still need to seal. The slippery nature of synthetic still concerns me. Unless they figured out a way for the rings to seal adequately with syn as opposed to dino then I am still concerned. Dino oil is superior to synthetic for break in. Am I mistakin'?
E90 330i Ti Grey Burl/ZSP/ZPP/Navi/PDC Manual