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I can only think of 2 possible issues. There was a problem with finding some very fine metal shavings in the oil on the Z06 and Z51 optioned Stingrays. It had to do with a possible machining issue on some part of the dry sump system. The solution was that Chevy provided an additional courtesy oil change at 500 miles to make sure the shavings were removed. I'm not sure if this started in '14 or the 15 Z06 models. Should not affect the car you are looking at with the miles already have on it.
Valve coking - This has been identified as a possible issue on any make vehicle that uses direct injection as the LT1 engine does. Fuel does NOT come thru the intake valve and deposits can form on the backside of the valves. Search for coking or valve coking on some of the Corvette Forums. FYI - lots of folks suggest installing catch cans to help reduce the issue. Whether that helps or not, you don't need to do this as the dry sump tank on a Z51 also functions as a catch can.
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