I bought my 2009 997.1 C4S in 2014 when it was 5 years old.
I knew nothing about Porsches and thought that the fan whirring away all the time the engine was on, was because it was a high powered sports car and needed extra cooling, particularly as the oil temp was continuously at 110 deg C.
When I arrived home after a run out the fan would run continuously even after the engine was switched off until it had cooled down.
Long story short, the simple solution was that there was a twig stuck in the fan blade on one side of the car. The other side fan was over compensating. To get to the fans the inner wheel arches need to come off, you might be surprised what you find in there, as twigs, leaves, rubbish, etc does accumulate. Once the twig was removed the fan operated as normal and oil temp was a constant 90 degC. Good luck.