I am checking regularly the Porsche website to look for a used Boxster GTS that meets my specification. I see that some of the vehicles that the Porsche dealers are selling are “Porsche Approved” but some others not.

Why is that?

Is because the previous owner of the car did not want to pay to get the “approval”? or is it because the car did not pass the inspection to be “approved?

The underlying question is: is it safe to buy a used non-Porsche Approved from a Porsche dealer?