Interesting Oil Change View

I stick to my 3000 miles, just because it makes me happy. My Valiant only gets about 500 miles a year put on it so far.
So I just change it about every 6 months due to moisture forming in my pan due to the climate in my area here. These are older engines, with looser tolerances.
My wifes Nissan Xterra is a 2003, with close tolerances. I run Castrol dino oil in it. I change hers about 3000-4000 miles. It gets used daily.