Spark Plugs NGK

NGK Spark Plugs, as fitted to many of the Elise and Exige range at the factory.
Sold in car sets of four spark plugs.

The Spark plugs for the K series and Supercharged Toyota engine have 'Platinum' electrodes.
The spark plug used in the N/A 2ZZ Toyota engine has an 'Iridium' centre electrode.

Lotus recomend that the sparkplugs in the Toyota cars are changed at 60,000 miles or 6 years, whichever arrives first.