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According to the 2003 Ford Taurus Owner Guide the ( Motorcraft FL-820-S ) engine oil filter is used for the 3.0 liter - DOHC - V6 engine
According to the 2000 Ford Taurus Owner Guide : For the 3.0 L , DOHC , " Duratec " V6 engine : With engine oil filter change : ( 5.2 litres / 5.5 U.S. quarts )
According to the 2001 Ford Taurus Owner Guide : With engine oil filter change : The 3.0 liter DOHC , " Duratec " V6 engine uses the ( Motorcraft FL-820-S ) engine oil filter with ( 5.2 liters / 5.5 U.S. quarts of 5W-20 )
Just above the oil filter on the front of the engine block. (Very hard to get to; most people remove the oil filter and dipstuck tube to remove/replace the oil pressure switch or "sending unit.")
According to the 2007 Ford Five Hundred Owner Guide ( 6 quarts with engine oil filter change ) for the 3.0 liter DOHC Duratec V6 engine
According to the 2006 Ford Freestyle owners manual , the 3.0 L - DOHC - Duratec V6 engine takes ( 6 quarts / 5.7 liters ) WITH ENGINE OIL FILTER CHANGE
With engine oil filter change : 4.5 quarts for the 3.0 L - Vulcan - V6 engine 5.5 quarts for the 3.0 L - DOHC - Duratec - V6 engine according to the owners manual
According to the 2009 Ford Fusion Owner Guide : With engine oil filter change : The 3.0 liter DOHC , Duratec engine takes ( 6.0 U.S. quarts )
With engine oil filter change : The 3.0 liter " Vulcan " V6 engine takes ( 4.5 quarts ) The 3.0 liter DOHC " Duratec " V6 engine takes ( 5.5 quarts )
According to the 2004 Ford Taurus Owner Guide : The 3.0 liter DOHC " Duratec " V6 engine takes ( 6.0 U.S. quarts with engine oil filter change ) * I'm assuming that the " Duratec " is the engine in the SES , if not , the 3.0 liter " Vulcan " V6 engine takes 4.5 U.S. quarts with engine oil filter change *
The 2004 Ford Taurus Owner Guide shows ( 5W-20 ) for the 3.0 liter Vulcan and 3.0 liter DOHC Duratec engines
Either replace with a known good switch or with a manual oil pressure gauge