The 2006 Kia Optima has 16 valves.
The 2004 Kia Optima has 16 valves.
The 2003 Kia Optima has 16 valves.
The 2007 Kia Optima has 16 valves.
The 2005 Kia Optima has 16 valves.
The 2014 Kia Optima has 16 valves.
The 2001 Kia Optima has 16 valves.
The 2008 Kia Optima has 16 valves.
The 2012 Kia Optima has 16 valves.
The 2011 Kia Optima has 16 valves.
The 2009 Kia Optima has 16 valves.
The 2002 Kia Optima has 16 valves.