How often should I change the oil on 1998 Boxster ?

[madmods]

If you drive it lower than 3,000RPM then you are 'okay' to change at 10k interval.

If you drive it in the 4000RPM range then you should change at 5k interval.

If you like to push it at red line occasionally, then you should think about changing your oil every 2.5k interval. Especially during hot summer

Hope this helps

[Mrmaddbrad]

I disagree with Madmods... I was curious about since the IMS bearing is such a flaw in these cars why it was never adressed and warrantied. So I called Porsche and they proceded to tell me that because people "don't drive them they way they are made" is not their problem.

He said the 10k miles per oil change is build for cars that are being driven hard and are then allowed to cool properly. Basically a track car is what he was describing... But on the streets 5k mile oil changes are the best idea, and earlier can never hurt. You'll find a lot of members on the forum change it between 3k and 5k miles.