Changing Oil Filter without Changing oil?

[Adam]

According to the scheduled maintence recommended by Porsche they say change the filter every other oil change or every 30k miles. This is probably why they changed the oil, but not the filter. I don't follow that routine, but that's what they say for 986 maintence.

[Tool Pants]

You can change just the filter and only 1 1/2 cups of oil will come out.

The rear main seal is above the oil level so oil is not usually replaced for an RMS replacement. The intermediate shaft seal is below the level so when that seal is replaced the oil is drained.

If the seal was replaced under warranty then most likely the filter was not replaced because Porsche will not pay the dealer for it. Porsche says the filter is good for 30k miles anyway.