 2010-2014 3.5 v6 engines in Taurus, Flex, Explorer etc. 60k miles plus. Water pump fails and (yes, it's unbelievable but true) sprays coolant into the crank case and kills engine. $7k for a new engine. $4k for a used engine. If you own one of these, be ready or sell now. If not, say away. Just google it, the issue is all over the forums. Just happened to me at 115k miles.