It depends on how you write it out.
You can write it as: dieciséis OR diez y seis
The 2005 Hyundai Accent has 16 valves.
The 2014 Hyundai Accent has 16 valves.
The 2006 Hyundai Accent has 16 valves.
The 2011 Hyundai Accent has 16 valves.
The 2007 Hyundai Accent has 16 valves.
The 2012 Hyundai Accent has 16 valves.
The 2008 Hyundai Accent has 16 valves.
The 2010 Hyundai Accent has 16 valves.
The 2003 Hyundai Accent has 16 valves.
The 2004 Hyundai Accent has 16 valves.
The 2009 Hyundai Accent has 16 valves.
16 - dieciséis22 - veintidós23 - veintitrés116 - ciento dieciséis122 - ciento veintidós123 - ciento veintitrésetc.