One problem related to frame rust has been reported for the 2005 Mazda MX5. The most recently reported issues are listed below.
Purchased this used 2005 Mazda miata about a month ago. Servicing many components since purchase and learning about this vehicle. Found blog about premature frame rail rust on many miata's (shocked to find out many miata's have this, and disappointed that I have to worry about premature frame rail failure under engine of vehicle. Here is the link to one of the blogs (according to this site, national Mazda has been willing to do nothing for Mazda owners to this point). . Read more...