Four.
The 2008 Lancer uses a 4 cylinder engine, therefore it uses 4 spark plugs.
The Mitsubishi Lancer typically uses NGK or Denso spark plugs, with the specific part number depending on the engine variant and model year. For example, many models with the 2.0L engine use NGK IFR6A-11 or Denso K20PR-U11 plugs. Always consult the owner's manual or a parts specialist to confirm the correct spark plug for your specific Lancer model.
Six
Most had a V-6 under the hod, which would mean 6 spark plugs.
The 2014 Mitsubishi Lancer has 16 valves.
The 2012 Mitsubishi Lancer has 16 valves.
The 2004 Mitsubishi Lancer has 16 valves.
The 2010 Mitsubishi Lancer has 16 valves.
The 2005 Mitsubishi Lancer has 16 valves.
The 2013 Mitsubishi Lancer has 16 valves.
The 2006 Mitsubishi Lancer has 16 valves.
The 2003 Mitsubishi Lancer has 16 valves.