Here is a Transmission Fluid Flush Tutorial Pertaining to any Year Ford Focus
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Ford Focus Models
First, a word of caution: Be very careful about flushing the transmission of any focus with more than 100,000 miles on the clock. Though the transmission’s original-equipment synthetic oil does help to prevent varnish, there’s no guarantee it could happen. Flushing a transmission with excess varnish build-up will result in almost immediate failure, which will require a complete re-build to correct.
Before you flush your transmission fluid, first use a synthetic-compatible transmission flushing additive like LubeGuard and drive the vehicle for 10-15 miles. This and other detergents commonly available will dissolve the built-up varnish before flushing, which will reduce the overall cost of the procedure.
What You’ll Need
You’re going to need a transmission filter kit, and at least 10 quarts of either Mobil 1 Synthetic Multi-Vehicle ATF (Automatic Transmission Fluid) or Castrol import Multi-Vehicle ATF. You could use a jack and jack-stands to raise the vehicle, but ramps are safer to use when the engine will be running while suspended. you’ll also need two clean, one gallon milk jugs and possibly 3-5 feet of rubber transmission fluid lines and hose clamps.