Classic/Antique Car Repair: Oil Change, routine oil changes, variable viscosity

Question
I have a 68 Mustang with 128,000 miles on it.  I only drive the car about 1000 miles a year.  My question concerns routine oil changes.  How often should I change the oil?  Also, what type of oil would be better to use with this type of use?

Answer
First, I want to explain the delay in my answer:  The All-Experts site has a problem that they seem unable to fix - it causes as much as 3 days to elapse before they send me the questions.  I just got this this minute!

You have a problem that all of us in the old car hobby face - and I don't really know of any scientific study of this issue.  What I do, and have done for over 40 years, is change my oil every 1500 miles or every year, whichever happens first.  I use SAE30W oil in all my old cars, I buy the NAPA store's best brand of premium oil. Do not confuse this with non-detergent oil, which some will recommend, but I definitely DO NOT recommend non-detergent oil.   The NAPA premium straight 30W oil is the top grade of oil.    Also, do not confuse this with 10W30 or any of the other variable viscosity oils - that is not as good a lubricant as straight 30W in my opinion and experience, although I know there are folks who will argue the point.  Change your oil filter every other oil change, also.

Dick