[Scott]

Ok, so as for frequency of changing oil. Again, there's no solid answer short of taking your used oil in for an analysis by a professional. Generally speaking, the 3000 mile idea is mostly a myth that is still propagated by the Jiffy Lubes of the world. Even on old fashioned oil, most engines won't start to break it down until at least 5000 miles. Plenty of people refuse to change their synthetic oil for 8000-10000 miles. But again, not every car is the same, and not everyone's driving methods are the same.

I usually change out my synthetic oil every 5000-6000 miles, but I drive the car hard, including autocross and track days. I also check the oil level every 500-1000 miles.