Green
The 2003 Ford Focus has double overhead cam (DOHC).
According to the 2003 Ford Focus Owner Guide ( for North America ) ( 5W-20 )
probably dex-cool but there is antifreeze that will mix with anything they are doing away with dex-cool
Motorcraft Premium Gold Coolant- dealer only item
mercon III
Ford Gold or Universal Gold Antifreeze
its regular green ford didnt switch to GO5 until 2002-2003
I use Sierra at 50-50%. It's environmentally friendly, i.e: non-toxic.
Any brand of antifreeze can be used in a 2001 Ford Taurus such as Prestone. The antifreeze can be 50 50 antifreeze.
According to the 2003 Ford Expedition Owner Guide it came from the factory with : Motorcraft Premium Gold Engine Coolant ( yellow - colored ) Meeting Ford specification ( WSS-M97B51-A1 )
2.0l DOHC zetec 4 cylinder
Dexcool