You want opinions? OK, I'll give mine then........go for Mobil 1 5w-20 synthetic. One of the best oils out there. It is totally unecessary to allow 12k miles before using it. Many cars come from the factory with this high-grade oil already in the crankcase. I would just wait to change your original oil until the OLM tells you to. After that, put the Mobil 1 in and all will be well. Synthetics may, very slightly, increase your mpg....but this is not a big benefit. The real bonus about synthetics is less sludge buildup over years of ownership (cleaner engine), better protection during extreme conditions (towing, heat, idling, short trips), excellent cold-start viscosity, longer drain intervals with usually less degradation than dino oil, and the satisfaction and confidence that comes with knowing you've used a top of the line product for a $30k vehicle. Just be sure and use a quality filter as well like a Purolator, Mobil 1, or Amsoil oil filter.