My wife has a 2016 Edge Sport. PTU failure at 9,500 miles. Previous Edge was 2010 Limited. PTU Failed at 59,000 miles and was replaced under warranty. I changed the fluid in it after the failure every 5000 miles (probably overkill, but cheaper than a repair) and it was still going strong after 130,000 miles. This has been an issue with the older Ford Edge AWD, I am surprised that they haven't addressed it in the newer ones.