This is from Porsche Website http://content3.us.porsche.com/prod/boxster/boxsters.nsf/usaenglish/designmaintenance 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 the Boxster and Boxster S 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. So you can enjoy your new Boxster for two years or 20,000 before you Will German Castrol last 20k? This is crazy!