clare at snyder.on.ca wrote:

I consider about 75-80% of in-town driving (and in-region in our area)
to be "severe service".

You may consider it severe, but the manufacturer doesn't. There is no
evidence that doing twice as many oil changes as the manufacturer
recommends has any effect on engine life. It doesn't really hurt
anything to change the oil at 3000 miles, or 1000 miles for that matter,
but all the independent tests of engine wear versus oil change interval
have proved that there is no advantage to following the severe service
interval for non-severe service.