According to the 2006 Ford Taurus Owner Guide :
The only engine available is the 3.0 liter " Vulcan " V6 ( and it's flex fuel version ) and
( it takes 4.5 U.S. quarts of 5W-20 engine oil , with engine oil filter change )
The 2006 Ford Taurus has overhead valves (OHV).
DOT3
I was looking at the 2006 Ford Taurus owners manual and it shows : The 3.0 liter " Vulcan " V6 engine ( and its flex fuel version ) That engine is an Over Head Valve / pushrod design engine
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 2005 Ford Taurus has overhead valves (OHV).
The 2002 Ford Taurus has overhead valves (OHV).
The 2001 Ford Taurus has overhead valves (OHV).
The 2010 Ford Taurus has double overhead cam (DOHC).
The 2014 Ford Taurus has double overhead cam (DOHC).
The 2012 Ford Taurus has double overhead cam (DOHC).