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There are few people who will complain about changing a car's oil TOO often, but for a car (not a boat), 4000 miles, especially on a boxster, is fine on the oil even for 3 years, was there a reason you changed it so often? There are theories about overchanging your oil, not common anymore, but did you suspect a problem before? Did you mention if the car was an auto or stick? How high do you typically rev the engine to before changing gears? If you lookup on the common causes of the IMS failure, its commonly from a dried out oil seal, fixed by people driving it like its suppose to.
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