The 3.0 liter " Vulcan " V6 engine is an Over Head Valve ( OHV ) pushrod design
The 3.0 liter " Duratec " V6 engine is a Dual Over Head Cam ( DOHC ) design
You could have the 3.0 liter - OHV - Vulcan - V6 , the flex fuel version of the 3.0 liter - OHV - Vulcan - V6 , or the 3.0 liter - DOHC - Duratec - V6 engine
A 1993 Ford Taurus V6 requires 4.5 or 5.0 quarts of oil, depending on the specific engine size. Ford made a 3.0 OHV, 3.0 DOHC, 3.2 DOHC, and 3.8 engine sizes for that particular year. 3.0 OHV = 4.5 quarts 3.0 DOHC = 5.0 quarts 3.2 DOHC = 5.0 quarts 3.8 = 4.5 quarts
The 3.0 liter " Duratec " engine is a DOHC design The 3.0 liter " Vulcan " engine is an over head valve ( OHV ) design
In a 2000 Ford Taurus : There were 3 engines used depending on model A 3.0 liter " Vulcan " V6 engine ( and it's flex fuel version ) which is an OHV / pushrod style design and The 3.0 liter " Duratec " DOHC engine ( Dual Over Head Cam )
The 2006 Ford Taurus has overhead valves (OHV).
The 2005 Ford Taurus has overhead valves (OHV).
The 2003 Ford Taurus has overhead valves (OHV).
The 2004 Ford Taurus has overhead valves (OHV).
The 2007 Ford Taurus has overhead valves (OHV).
The 2001 Ford Taurus has overhead valves (OHV).
The 2002 Ford Taurus has overhead valves (OHV).
If you are swapping the Vulcan OHV engine, it will work without issue. If you are attempting to swap the Duratec DOHC engine, it will bolt in, but the computer will not be capable of running the engine.