My 6th gear synchro started to go at around 15,000 miles. It had nothing to do with the way I was driving. I baby my Z. Its easier to replace the trans then it is to swap out the synchro. There are several threads on here about transmission issues. If you dig around a bit, you'll come across them.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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