An October 2004 build date is part of the 2005 model year. Generally production of new MY vehicles begins around August. For example, my 2004 Z has a build date of 08/03. All manufacturers are like that.
As far as which dates have more problems, build dates 08/02 - 07/03 (MY 2003) have seen the most problems.
Thank you for your responses... just to let you know.. I am glad to be a part of the nissan z enthusiasts.... drove a 9 year old mits eclipse gst and hope to have the same durability w/ nissan.
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