The 2009 Audi S4 has a 4.2 L base engine size.
The 2008 Audi S4 has a V8 engine.
The 2010 Audi S4 has a V6 engine.
The 2006 Audi S4 has a V8 engine.
The 2011 Audi S4 has a V6 engine.
The 2002 Audi S4 has a V6 engine.
The 2013 Audi S4 has a V6 engine.
The 2004 Audi S4 has a V8 engine.
The 2005 Audi S4 has a V8 engine.
The 2012 Audi S4 has a V6 engine.
The 2001 Audi S4 has a V6 engine.
The 2007 Audi S4 has a V8 engine.