Sounds like you use the same motor mount the focus use's, and in that case, yes it is a hydraulic type motor mount, and is filled with hydraulic fluid.
From looking at auto part store's, it furthers my theory.
http://www.autopartswarehouse.com/sk...%26+Drivetrain
WESTAR ENGINE MOUNT, SOLD INDIVIDUALLY --
Hydraulic; A high quality, direct fit OE replacement engine mount; Easy installation.