But there those of us who don't want to spend all our time changing oil every 3 months or 3000 miles. Once a year is about all I have time for and synthetic oil has over the last 25+ yrs given me piece of mind that my vehicles are getting the best lubricants I can find. From driving company vehicles for over 30 yrs I noticed that few of them were worth anything after 150,000 miles so who cared how good the engine was, dump it and move on.
I wish in all those years I had the forethought to keep records of my expenses. But I would not be surprised if I spent a lot less on maintenance and got as good if not better results for a lot less money + I did not have to trust some quick lube place or kiss some dealer butt to get my vehicles serviced when it was needed. Every November I have the dealer change my oil and filter, lube chassis and check it all out.
According to an article in the March issue of Lubes n' Greases magazine some 300-400 million gallons of oil is produced every year just to support the 3,000 mile oil change. Thats quite a chuck of profit for the oil companies!
I would suggest everyone read the article (I did), it will tell you were the motives for the 3000 mile oil change and they have you all convinced.