being in florida with the hot weather of summer approaching 10W-30 shouldn't be a problem. However, there is a chart in the owners manual showing which oil viscosity grades are recommended for given ambient temperatures. I remember that the 5W-30 is listed as the recommended oil across the temperature board, while the 10W-30 was recommended for ambient temperatures above 60 degrees F or so.
The numbers associated with a multi-grade oil are as such. the first number dictates the oil's cold flow charagteristic measured at (if I remember correctly) 20 degrees F. The second number dictates the oil's flow characteristic while hot 120 degrees F sounds familiar.
So if I'm right, then that would lead me to believe that both 5W-30 and 10W-30 should flow the same when hot. Its just that the 5W-30 won't get as thick in the cold as the 10W-30.
Its also my understanding that the geater the difference between the 2 numbers the less the oil's viscosity will change as its temperature changes. This is also referred to as viscosity index.
