A good read I just found on Yahoo, of all places. I'm still stuck in the ol' 3k-4k train of thought with oil changes, but I might make the switch eventually.
The oil change interval or OCI is the recommended mileage interval between oil changes. There is a large debate on when you should change your oil and the classic consensus has always been that it should be done every 3 months or 3000 miles. This is the main point of contention when discussing the cost and environmental benefits of synthetic oil. In my area, the current specials show 5 quarts of conventional at $13 5 quarts of full synthetic at $22. If your car takes exactly 5 quarts and you do a 3000 mile OCI then your cost per 1000 miles on the conventional is $4.33. In order to reach the same cost with the synthetic you would need to extend your OCI to 5080 miles.
http://oppositelock.jalopnik.com/the-truth-about-motor-oil-is-synthetic-worth-it-1687938812
The oil change interval or OCI is the recommended mileage interval between oil changes. There is a large debate on when you should change your oil and the classic consensus has always been that it should be done every 3 months or 3000 miles. This is the main point of contention when discussing the cost and environmental benefits of synthetic oil. In my area, the current specials show 5 quarts of conventional at $13 5 quarts of full synthetic at $22. If your car takes exactly 5 quarts and you do a 3000 mile OCI then your cost per 1000 miles on the conventional is $4.33. In order to reach the same cost with the synthetic you would need to extend your OCI to 5080 miles.
http://oppositelock.jalopnik.com/the-truth-about-motor-oil-is-synthetic-worth-it-1687938812