Oil change on a Boxster is one of the easiest I've ever done. About $60 for the oil and parts. First time you'll need to purchase a couple of "special" tools (filter can wrench to fit the Porsche part, correct size hex wrench/socket for the drain plug) and some low clearance ramps (if you don't have your own lift
). Total DIY cost for a first change ran about $100 including the tools.