As I said above, frequency. The owner's manual for every car says this is a potential issue. E.g. https://www.fordservicecontent.com/Ford_Content/vdirsnet/Owne

As I said above, frequency. The owner's manual for every car says this is a potential issue. E.g. https://www.fordservicecontent.com/Ford_Content/vdirsnet/OwnerManual/Home/Content?variantid=9043&languageCode=en&countryCode=USA&Uid=G2195905&ProcUid=G2194034&userMarket=CAN&div=f&vFilteringEnabled=False&buildtype=web https://www.fordservicecontent.com/Ford_Content/vdirsnet/Own... And yet most cars you see on the road look okay. Unless this is substantially more common than others cars this could be much ado about nothing.