I use 10w30, but Its better to switch to 5w30 for the winter right, cause Its thinner? Then you wouldnt clog your oil pump, I heard something about that, just wanted to check.
Oil for winter - 6G Celicas Forums
i got 145xxx miles on my 5s and i'm using 10w-40 oil........but then agian i live in hawaii. 
I don't normally drive fast, but when I do its on a curvy section of this island
only if you're starting your car when its below freezing all the time. i've been running 10w-30 mobil1 on a 7afe for the past 3 years during chicago winters in temperatures below zero and havent had a problem.
2000 Celica GTS 'slowest gts evar'1998 Mazda 626 FS-DE/CD4-E