It's 8 years OR 100,000 miles, whichever comes first. For the model years you listed even if the vehicle has less then 100,00 miles, the warranty has expired if sold 8 or more years ago. It's possible that an 2008 might have sold in 2009 and still have a few months left.

 

I am original rx8 owner and was never informed. I will retire my.zoom zoom after 13 yrs and 166k