Recently we have been hearing about a new Castrol 0W3-30 oil from Germany. It probably costs something like 5-6 dollars at AutoZone. I think I will go the Schaeffer's route. Schaeffer's part synthetic is about 3 dollars (or course you have to add the shipping costs) and you have a proven motor oil that can probably go the same distance as the synthetic oils. Plus the Schaeffer's Oil is available in the viscosity you need. 5W-30 with a little Auto-RX added sounds good to me. Of course, if this new Castrol oil proves to be really incredible, I might change my mind.