The standard Chrysler offering is not a "run-flat" tire. A true "run-flat" or "zero-pressure" tire has a stronger sidewall than a typical tire. Some have different bead designs. If you ran at 15psi for a few days, take the car into any tire shop with a good reputation in your immediate area and have them take a look at it. Let them dismount it from the rim and check the inner wall. It will cost all of $20.00 maybe and a half hour of your time. Isn't your car worth it or for that matter...aren't you worth it. Any tech that told you that this is a "run-flat" needs to be reported to the dealership service manager, cuz he missed a day at ASE certification class and he should be hit with a tire iron in hope of jarring his gray matter a bit. That kind of information puts you in jeopardy and continues to give Chrysler service a black eye.