We've updated our reliability stats for the Z to include owner experiences through September 30, 2016.
Repair frequencies, in terms of repair trips per 100 cars per year (lower is better):
2009 370Z: 8, low, small sample size
2008 350Z: 42, low, very small sample size
2007 350Z: 0, low, very small sample size
2006 350Z: 24, low, small sample size
2005 350Z: 49, low, small sample size
2004 350Z: 32, low, small sample size
2003 350Z: 58, low, small sample size
Additional participants always helpful, especially for years without stats or with small sample sizes.
For the repairs behind these stats, reliability information on other models, and to sign up to help improve this information:
Nissan Z reliability ratings and comparisons