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My take on this after doing an exhaustive amount of research is this... Like the author said you should check your recommended mileage in your owner's manual, but also consider the following.
There are usually two recommendations in those manuals; normal and severe. The average time it takes for oil to get up to temperature and start doing its job of clearing dirt, not just lubricating, is about 45 minutes. If you are doing a lot of stop and go driving or frequently have the engine running for less than thirty minutes then you are exposing your vehicle to severe conditions. If you frequently warm up your car before traveling and/or mostly do highway driving than you could take the normal driving recommendation as stated by the vehicle manufacturer.
You can also utilize synthetic media filters and oils to extend the change interval but use your discretion and common sense. Although you can do what ever you want to do with your car remember that a lack of records indicating an oil change history based off of the recommendations can void a warranty or even lower the value of your vehicle when you are looking to sell it or trade it in.
Being that I am fairly handy when it comes to fixing most things on my car I don't honestly care that the recommended mileage states 4,500 miles. I am no longer under warranty and will probably keep this car for a while. I use full synthetic oil and a synthetic fiber filter that makes me feel comfortable with a 10,000 mile change interval. Pretty much every six months I change the oil and also because of the timing plan other maintenance such as the transmission, air filter, fuel system, etc.
Hopefully this helped some of you. Always do your research and trust the vehicle manufacturer more than a product label.
2 years ago on Don't Be Fooled Into Thinking an Oil Change Every 3,000 Miles Is Necessary