I recently acquired a 2017 base Cayman with no more than 22,000 km (~14,000 miles). The car was in perfect shape and had been owned for less than 2 years by Porsche itself and mostly driven -from what I saw in the nav system- between Stuttgart's private airport terminal and Porsche HQ. I found it a bit weird that the car was not sold as a CPO by Porsche itself but by an independent reseller, but all the paperwork and car condition checked out and I bought an extra year of warranty from a 3rd party insurer for my peace of mind.
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I rapidly started to put miles on the car and after about 1,000 miles I started to notice a kind of rattling noise around 3,000 RPM that kept getting louder. It definitely was not there when I bought the car and everything still seemed to be OK (oil level, no warning of any kind, power output OK...).
Convinced it could not be anything too bad, I still went to my local Porsche dealership. They also thought that some minor part of piece of trim had come loose around the engine and kept the car for further investigation. It turned out that nothing had come loose but checking the oil and oil filter, they found small metal flakes ?. They could not offer any explanation so as to what had gone wrong (oil level was OK, oil pump was fine). Fortunately the car was still under original Porsche warranty for a few weeks and Porsche Germany immediately shipped a new engine to the dealership to be installed at no cost.
I am now breaking in my new engine properly and have been extremely happy with Porsche' service but am still perplexed at what actually happened. I have driven several Porsches very hard on the road and on the track (996, Cayman R, 997 GT3, 991 S, 987 S), some of them with more than 80,000 miles under the belt without the slightest issue. Could it be that Porsche actually knew there was a problem with the car and got rid of it through a wholesaler rather than CPO'ing it ? Yet, Porsche's official records shared by the dealership did not show anything... My dealership -who is reputable and trusted- was as surprised as myself as they proceed to engine replacements extremely rarely, and certainly at such a low mileage.
I can't help to think that there was something fishy to start with, but with a new engine and the car now thoroughly checked and serviced by Porsche, I feel OK and hope it was nothing more than an isolated incident.
If you have an opinion about what may have happened (or about my naivety ?), feel free to comment !