Taking your driving habits into account, changing oil more often than 4K or 5K miles would be a waste (unless UOA tells you otherwise, which is always the case regardless of time/mileage).
FlimFlam: Your comments are funny, and actually apply to any European sporting engine. I was a director with the local Alfa Romeo club and raced with them for 15 years here in California. The competition director here bought an Alfa Milano in Alabama for his girlfriend -- he had to look that far for a clean example with an auto tranny. The car was in great shape but was sluggish -- it's owner was a middle-aged woman who drove like a turtle. My buddy intentionally drove the car like an idiot all the way from Alabama to California, supposedly averaging 90+ mph. He must have blasted a ton of carbon out of the cylinders, because it ran like a champ once he got it home. These engines are designed to be revved. My sister also drives her Saab Turbo like a turtle -- I keep telling her to "Get on freeway on-ramps, put the gas pedal to the floor and keep it there -- trust me, it's a GOOD thing for that engine!"