The lawsuit against Porsche, I believe is for engines in the 01-05's. You might want to check the lawsuit settlement program. My 2000 S with a 3.2 liter has 75,000 on it now and purrs like a kitten. To me it appears to be a lot Boxsters with manual transmissions that have had this failure. Not totally sure. I wouldn't worry myself. Enjoy the ride.
Look at what Pedro has for bringing oil to the IMS.
http://www.pedrosgarage.com/Site/Products.html