The 2004 Audi S4 has double overhead cam (DOHC).
The 2010 Audi S4 has double overhead cam (DOHC).
The 2001 Audi S4 has double overhead cam (DOHC).
The 2012 Audi S4 has double overhead cam (DOHC).
The 2009 Audi S4 has double overhead cam (DOHC).
The 2005 Audi S4 has double overhead cam (DOHC).
The 2002 Audi S4 has double overhead cam (DOHC).
The 2011 Audi S4 has double overhead cam (DOHC).
The 2014 Audi S4 has double overhead cam (DOHC).
The 2006 Audi S4 has double overhead cam (DOHC).
The 2007 Audi S4 has double overhead cam (DOHC).
The 2008 Audi S4 has double overhead cam (DOHC).