Good info, thanks. 15w-50 has the same pour point as 10w-30? Hum; interesting. If that's true, then I guess I know what I'll do at the next oil change.
I guess my other question is if anyone is aware of a 15w-40 synthetic on the market. On the other hand, if the modifiers in 10w-40 are no longer an issue, than maybe the Amsoil 10w-40 is a good option (in addition to Mobile 15w-50).
Thanks, and remember, I don't mean to start brand war, I'm just tossing around viscosity vs. local temperature ideas.