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I change my own oil. Mostly because of the convenience and secondly I can be sure of the oil that's going in. I change the oil in my 1998 Honda every 3k miles or 3 months, whichever comes first. It is a simple, inexpensive and important maintenance. I ramp the car and while the oil is draining I can do something else, then come back and finish. This is way better than sitting and waiting while someone else does it, or coordinating drop off and pick up.
With the Boxster, it is not quite inexpensive, but also can go longer. I change the Box oil every 5k miles.
Engines love clean oil and even a rarely driven car should be maintenanced with periodic oil replacement. I don't think there is a serious concern between 3k miles and 4.5k miles, but I prefer my old fashioned 3k.
Just my $.02
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