See also:

Underbody
Flush the complete underside of your vehicle frequently. Keep body and door drain holes free from packed dirt. ...

Driving through water
If driving through deep or standing water is unavoidable, proceed very slowly. Never drive through water that is higher than the bottom of the wheel rims (for cars) or the bottom of the hubs ...

SAFETY
There's no hunting or digging for Latch connectors in the MKZ. They stuck out from the cushions, so there wasn't any thumb-wrestling with overstuffed cushions to get everyone's child-safety seats ...