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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.
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