You should run, 0 or 5W-40. I think Schaeffer series 9000 is about the best oil you can get and it is reasonable prices. My service rep did some oil analysis for me to prove it out. Also, I can tell the difference in how much better the oil feels at oil changes.
The new oils calling out 0 W-20 weights is purely for gas mileage and doesn't help the engine at all.
