[Perfectlap]

This should be a standard test before buying all Boxster and Carreras...
But it could be misleading if the seller changes the oil right before putting it up for sale. And that's if they'll let you cut it open in the first place.

I guess it makes sense to hold onto all your old filters from the last year or take to take pictures after the autopsy at least. That would be a good way of monitoring as the mileage goes up.