There is another advantage to chaning the oil
frequently. It gives you the opportunity to put the car up on a lift and inspect it. You'd be surprised at what you will find. I found a leaking steering box (which I am monitoring - not fixing yes) and a leaking shock (I replaced all 4).
I have found that this 'check' gives you the opportunity to anticipate your maintenance and repair costs, consider alternative courses of action, etc. Example: I was originally quoted $182.00 for EACH of my fron t shocks. After a couple of weeks of investigation, part verification, etc. I got front Bilsteins for about $86.00 each.