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porsche also says change the oil at 15k, that the ims and water pump are lifetiime service items, you don't need to ever change the coolant, etc. the porsche recommended service schedule is a minimum standard that should be exceeded, not met. if you want to change you plugs every 30k then go for it, your car won't be any worse off, especially noting that while the lifetime of the actual plugs may exceed 30k, that of the associated plastic tubes and o-rings may not (mine had cracked and were leaking at less than the recommended service interval). inspecting the plugs is a great way to get an indicator of how things are going inside the engine and, for the cost of a set of plugs vs labour, once they are out for inspection you may as well put new ones in.
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