The W just means it's been tested to pump in cold weather. For your location, yea, I'd just run 10w-30 in the winter, and maybe 15w-40 in the hot summer, or a monograde 30 or 40 weight in the summer. With your driving conditions, you should be able to go 7500 miles, but get a oil analysis just to make sure. The Delo in those conditions should handle it no problem. What model of veheicle?
On a side note, does anyone know where to get 10w-30 delo, or any other heavy duty 10w-30?
On a side note, does anyone know where to get 10w-30 delo, or any other heavy duty 10w-30?