Loren's survey included other questions that show the very cold climate where you live may affect the RMS
AND, the way you warm up your Boxster may also affect the oil seals.
Design changes may have also included material specification changes in the rubber/plastic.
...what say you about this?
I live in warm Arizona and the car spent its early years in Houston, TX so...
Oh, and I do warm it up before >3K RPM
Ed