Mobil 1 flows much better at cold temps than conventional oil.  The 15/50 should be good year-round unless you are up near the arctic circle.

On Mon, 27 Apr 2009 08:02 -0700, "dylan friedman" <insyncro@YAHOO.COM> wrote:
> I keep it in all year, but only drive the van in the summer months.
> It could be used here in New England if garaged and a block heater is
> used.
>
> I use the extended version and change it once every five thousand miles.
>
> dylan
>