When I do my first oil chaneg i will be going with 0W20 and I am in Atlanta. Regardless of climate 0W20 will get through the engine faster during startup than 5W20. With all the stopping and starting of the engine I figure it will only benefit the engine in the long run. And for Mobil1 all the grades are usually the same price. The difference is if you go with 5W20 you can get non-synthetic and save $$, but as i only use synthetic it is no difference to me to use 0W20.