I actually made the switch from 5W30 to 0W30 during the summer. Both oils cost the same for me and since they both have the same viscosity at operating temp, why not go with the one that will flow better at startup? Seems like a no-brainer, even if it's not as much of an issue during the summer. Now that it's winter, I'm sure the 0W30 stuff is causing less wear at startup... I mean it's almost like water even on a 20-degree morning.
