Depends completely on the driving ..
short trips, cold temps ..
very rough on oil.
Longer trips, more operation fully warmed up ....is easier on the oil.

in modern cars that usually call for synthetic oil ..where there is a
circuit that monitors operating conditons ......some of those , as on a
modern mercedes will allow up to 15K between synthetic oil changes.
....depends very much on type of use of course ..

There is also a tendency in new cars to cite low maintaince requirements ..
if 'brand new' it says 10K oil changes ..a consumer might be drawn more
to a particular car than another.

so 'it depends' .
but if wanting to go to 10K miles...I'd say that's only if it's mostly
longer distances driven , and a high percentage of the time the engine
is fully warmed up.
  Once fully warmed up, and driven nicely ..there's not much wear.

it's that first half hour that's rough on things. especially in winter.

scott
On 12/6/2012 10:02 AM, Jon Durham wrote:
> Bostig recommends an oil change every 3 to 5K using synthetic oil. Since
> many sources cite changing it every 10K, I'm wondering if the
> recommendation is over kill.
>
> Jon
> --
> �All that we are is the result of what we have thought. The mind is
> everything. What we think, we become.� Buddha
>