I use Mobil 1 10w30 on my car also even up here in NY. It flows at -49 deg. so it's not a problem in colder weather either. BTW the new Mobil 1 with Super Syn. is even better than the old Tri-synthetic formula, i can feel a difference on my car. The 10w30 is better suited for higher milage cars according to Mobil. That's why i switched over from the 5w30,less chance of getting leaks as the miles pile up. My car has 91k miles and climbing lol... 
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06 1.8s SE Radium: Nismo stb,Nismo rsb,aFe drop-in,HKS Sport catback,tint, 17" Racing Sparcos, Falken ze-512s.
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