I've owned a lot of cars in my long life (new and used) and this has never been an issue with any of them. This tells me it's a design issue. And I also never use forums as a diagnostic tool as most forum members do not have automotive engineering degrees and are just average Joe's like the rest of us. Most employees at the dealership also are undereducated when it comes time to diagnostics. I always take my vehicle to a personal mechanic that I trust to get an unbiased diagnosis and fair pricing. I own a 2008 6.4 diesel Superduty as well that has never seen the inside of a dealership and I don't plan on taking the Edge there unless it is for a warranty repair such as the stinky ventilation system. Although I appreciate your opinion, I take it with a grain of salt.