I agree completely with all of the advice AKnowles has given, except that I do my own work or use an independent specialist that ONLY works on Porsche. I don't use the Porsche dealer for anything.
I bought my 2000 Boxster 2.7 ( 63k mile, garage kept, same owner 12 years, local California car) in March 2013 and here is a quick breakdown of the cost of ownership for the last 7 months (13k miles) not including suspension/safety modifications:
2x Oil and filter changes Motul 8100 5W40 (done by me) $190
IMS Bearing Retrofit (done by indy) $1798
6x New Spark Plug Tubes (done by indy) $66
New Motor Mount (done by indy) $153
New Serpentine Belt $45
4x ATE Brake Rotors and Pagid Pads (done by me) $590
4x Hankook V12Evo Tires 17 (mounted and balanced) $480
Total $3322
Keep in mind, this is all preventative maintenance except the motor mount, which was discovered during the IMS retrofit. I personally think these costs are pretty reasonable for a 13 y/o car that is regularly tracked, but you'll have to judge for yourself.
I highly recommend a pre-purchase inspection as well, so that you know what you're getting into... Take your time and you'll find the right car.
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