My 2015 Edge had a bad PTU at 42K miles, after a dealer replaced a leaking input shaft seal before I bought it used at about 22K. If the first dealer really did just replace the seal without changing oil, that seems funny. OTOH, if they "serviced " the unit and it only lasted another 20K miles, that gives a lifetime of only 42K miles, even with an oil change every 20K miles, or so. The PTU was replaced because of gunk coming out the vent and metal filings in the gunky lubricant. Sounds like a life of only 40K, even when replacing a seal at 22K. Looks like keeping the edge only until the powertrain warranty is about to expire. Sad, because I really like the car, otherwise.