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to improve the factory
you will need to deal the Power of Attorney who represents the owner of the vehicle.
Tha depends on where you download them from. If the person you are downloading them from is not legally the owner or an approved distributor of the themes then it is illegal.
Depending on an individual's personal tastes, you could have sports themes, religious themes, military themes, or one of a vast array of themes available, all dependent on what an individual phone owner likes and would choose to display as their theme.
It's in the owner's manual.
According to the 2002 Ford Focus Owner Guide : ( 13.2 U.S. gallons )
5W-20 , for the 2.0 liter engine in a 2008 Ford Focus ( according to the Owner Guide )
The procedure is in the Owner's Manual, but you have to have the original key to do it.
According to the 2003 Ford Focus Owner Guide ( for North America ) ( 5W-20 )
http://www.focusplanet.com/ This site has Ford Focus Owner's Manuals for years 2000-2007.
According to the 2006 Ford Focus Owner Guide : ( 14.0 U.S. gallons )