NGK Spark plugs SILFER8C7ES

NGK reference : SILFER8C7ES
The NGK high ignition capabilities spark plug are Iridium or Platinum in 2 types of technologies increasing ignition capabilities: insert of Platinum or DFE technology. These technologies offer replacement spark plugs with better performances and a better reliability.
Reference :
SIxxx: Iridium with Platinum insert
SDxxx: DFE tech with Platinum insert
SPxxx: Platinum with Platinum insert