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My theory on this matter has always been oil is cheaper than parts. The only car that I ever had that I didn't change the oil in was an old Chrysler I used to have. It had in access of 200,000 miles and was using a quart about every 300-400 miles so I just changed it by continuously adding oil. At 300-400 miles between adding a quart it was essentially changing its own oil about every 1500-2000 miles. I drove it about 30,000 miles without an oil change then ended up selling it because I had bought another car. I know the person I sold it to drove it several thousand miles before getting rid of it. I certainly wouldn't recommend not changing the oil on a regular basis. One of the cars I currently own is an '88 Ford Escort that has had regular service intervals of 3000-4000 miles and currently has 478,000+ miles on it and is still only using a quart of oil about every 1000-1500 miles. I feel sure that regular service and maintenance has played a huge role in its longevity.
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