Rust along the bottom of 2016 Lincoln MKZ doors

Rust on bottom of car doors

You should have a 5yr. transferrable rust warranty. Take it to the dealer.

Is that in writing someplace in warranty?
Appreciate the response.

Yes, you can find it and download it here:

Yes, but it is a rust perforation warranty.
Surface rust isn’t covered.

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There’s still the possibility the doors have rusted from the inside out. None of us can see the vehicle. Whether that counts as “perforation” is between the OP and the dealer.