I live in South Florida where it almost never drops below 60F much less (50F or 40F). I have some leftover 10w-30 from my last car (that suggested that type of oil until 100k miles where the suggestion was 10w-40 I think). I know that the manual suggests 5w-20 but would it hurt it much to use up the rest of this stuff instead? My car's still at 400 miles so that time is a ways off, but I would like to know now for when that time comes.
Also, if it is ok, what ramifications are there to using a different oil type however slight?