Personal opinion - change it lots. An extra oil change or two is far far cheaper than a new motor. 15K is silly - as someone pointed out - most manufacturers are now revising that to 10k. Even that seems high, especially on a high-performance, OLDER motor such as what we have.
Treat it well. Give it a fresh shot of oil to keep her clean as often as possible.
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2011 Boxster 987.2 Arctic silver / Black leather, PDK with Sports Chrono Package Plus
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