The 2008 Volvo S80 has 24 valves.
The 2004 Volvo S80 has 20 valves.
The 2005 Volvo S80 has 20 valves.
The 2012 Volvo S80 has 24 valves.
The 2011 Volvo S80 has 24 valves.
The 2002 Volvo S80 has 24 valves.
The 2010 Volvo S80 has 24 valves.
The 2001 Volvo S80 has 24 valves.
The 2006 Volvo S80 has 20 valves.
The 2015 Volvo S80 has 16 valves.
The 2014 Volvo S80 has 24 valves.
The 2009 Volvo S80 has 24 valves.