[jeffsquire]

The Porsche factory recommendation for a 2000 Porsche is a 15,000 service. THey recommend changing oil every 15,000. My Porsche (st)Dealership recommends service interval and oil change every 7,500 even though they acknowledge Porsche's recommendation of 15,000.

This is consistent with the 2006 Boxster looking at Porsche's website. They take pride in letting you know that your new BOxster needs service and oil change every 20,000. They following is from their maintainence page for the '06 Boxster.

"Longer service intervals are not only easier on resources—they also make good financial sense. Over the years, Porsche has consistently reduced its servicing requirements as well as the number of tasks.

"On both Boxster models, the intervals speak for themselves: engine oil every 20,000 miles (or two years), spark plugs every 60,000 miles (or four years), oil filter every 20,000 miles, and air filter every 40,000 miles. The brake fluid interval is two years, while the coolant is good for the life of the car.

"The bottom line? You can enjoy your new Boxster for two years or 20,000 miles before having to encounter your first regularly scheduled maintenance. As well as reducing the cost of ownership, this means you’ll spend less of your precious time servicing the car and more time doing what you love—driving it."
-www.porscheusa.com

I'm betting you'd get a different opinion for every dealership, though.