Jaykay, you need to learn the proper service intervals for your Boxster. A spark plug change is NOT only mileage dependent, it is also time sensitive.
For example a 2002 Boxster 986 is every 60,000 miles or 4 years.
For a 2006 Boxster 987 it is every 40,000 or 4 years (since my car will be 4-years young in March 2010, I am changing the spark plugs early, in October, as part of my winter hibernation prep.). My current mileage is about 33K.
Spark plugs are cheap maintenance, and one of the car's hardest working parts.
Search some old post regarding the use of anti-seize vs. NOT to use and Porsche's recommendation regarding such...and the proper torque setting. This was (using anti-seize) hotly debated a few years ago here.
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