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I thought 15k miles was a little long too so I took it upon myself to change the oil just last week. I was at 9k miles and honestly the oil was really clean for having 7800 miles on it. Just from visual inspection I think it actually could go 15k but I sent my sample to Blackstone for analysis just for a second opinion.
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2016 Porsche Cayman GTS - Sapphire Blue / Black Full Leather Interior / Carrera S Wheels
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