The older cars were likely all out of warranty in 2010, so they don't really care if you change the oil. They can sell more Porsche replacement parts that way.
For the newer models in which they still might have some liability to cover parts/labor, well you best be changing your oil frequently, or we'll void that warranty too.
The updated 2016 chart will probably have "At your leisure" listed for the M96 intervals.
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