I agree to mostly what was written above. Most people change oil too soon. If you have a good synthetic it'll last for a good 10k miles. What many people don't do is check oil regularly. Make sure no leaks or burns. Keep oil filled at all times. Now why synthetics are better is they typically handle different climates better than conventional oils. Ever see a conventional oil below 0 degrees? Compare that to a synthetic you'd never want to use conventional oil again. Now if ur in a hot state you won't have to worry about conventional oil solidifying. But conventional oils do burn off quicker then synthetics. So synthetics are the best way to go for Every situation.
Now some synthetics are better than others. That's a whole other discussion tho.
Now some synthetics are better than others. That's a whole other discussion tho.