Some 2011 Mariner, Milan, 2011-2013 Taurus, Explorer, Edge. MKK, MKS, 2011-2012 Fusion, MKZ, 2011-2012 Flex, MKT, 2013 Flex and MKT vehicles equipped with a 3.5L GTDI engine may exhibit an occasional fluid leak coming from the rear differential vent cap in temperatures below 32 degrees F under certain conditions.

1. Inspect the rear drive unit for oil leaking from the vent cap located on the rear cover. If only a slight residue is found around the cap, this is normal.
2. Remove and discard the vent from the rear drive unit cover.
3. Install a new vent and clean off any remaining residue.

The P/N for the new vent is DB5Z-4022-A.