Flex fuel does not mean you can use diesel. It means the engine can run on pure gasoline or on E85 gasoline. If you put diesel in this vehicle it simply will not run. Diesel can only be used in a diesel engine.
The 2014 Ford Flex has a V6 engine.
The 2013 Ford Flex has a V6 engine.
The 2010 Ford Flex has a V6 engine.
The 2011 Ford Flex has a V6 engine.
The 2009 Ford Flex has a V6 engine.
The 2012 Ford Flex has a V6 engine.
No , the engine has to be designed to be a flex fuel engine ( gas / E85 )
The 2011 Ford Flex has a 3.5 L base engine size.
The 2013 Ford Flex has a 3.5 L base engine size.
The 2009 Ford Flex has a 3.5 L base engine size.
The 2010 Ford Flex has a 3.5 L base engine size.
The 2012 Ford Flex has a 3.5 L base engine size.