I suspect Fred is right, the sound you heard might have been the ramp moving a bit. That said, holy lapse in judgment, Batman: you started the engine in your Porsche with no oil in it? Yikes. Good luck. The most prudent course has already been identified: flat bed it to a Porsche mechanic.
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2000 Boxster S, 6 speed, Sport Package, Litronics, LED tail lights, LNE IMS-B, OBC, Skybreaker wind deflector, Arctic Silver/Graphite Grey
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