Does anyone have any specs on BMW's High Performance Synthetic Oil? It only comes in a 5W-30 viscosity (now, used to be 5W-40) and it is made by Castrol. The catch is that it isnt made (not to my knowledge and my local BMW dealer's either) by Castrol N.A. Instead, its made in England by Castrol U.K. specially for BMW. What looks so darn appealling is that at only a 5W-30 viscosity its meets the ACEA A3-B3 standard! Not even Mobil 1's 5W-30, 10W-30, or any other similarly rated oil OTC can do this. And, at my local BMW dealer its only $3.80/qt(usd)! From those i;ve talked t, its claimed to be a real, honest to goodness syn. unlike Syntec. Its formula is similar to Castrol's non-North American 'SLX-0W-30' brand. It too is ACEA A3-B3 rated and touted to be VERY awesome. Any thoughts guys?