0w-20 all year round. Finding is troublesome though. Wal-Mart used to carry it, but they don't anymore. Luckily, I bought a year supply. I hope they start carrying it again soon.
Uh, here's another vote for 5W-20 all year. From what I remember of the Toyota recommendations, you can use either 0W-20 (which is synthetic) or 5W-20 (which is dino) year around. Probably not a good idea to switch back and forth. And shame on the person who voted for 10W-30 -- it's too thick.
Tried to confirm what they were using last change and was just told "they'll use the right thing" which didn't make me super confident. Especially since first change the guy had looked it up and realized it didn't take something special as he'd first thought. But I don't think they're itemizing it on my invoice so I can't really verify.
What grade of oil do you use?
