Platinum

Platinum_2

Platinum_3

The platinum does a great job of resisting erosion, so that the gap of the electrode stays virtually as set by the installer for as long as 100,000 miles.

$5.00/plug (Bosch - Platinum-1)

Indium

Indium

Indium

Laser Iridium® spark plugs provide superior ignitability and long service life. Smallest tip diameter available Iridium / Platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions

$8.57 (Denso)

Copper plugs have a very short lifespan
Approximately 15,00 miles

$7.19 (Champion)

Copper

Copper

The Chinese designed this plug but
it never made it to production

No Price Available

Variation Of Copper

Variation of Copper

E3 Spark Plugs are manufactured with the latest technology "DiamondFire"

$5.95 (Amazon.com)

E3_1

E3_2

This plug never made it to production and was designed by a company in Mexico

No Price Available

Technica

Techica

This type of plug uses the surface-gap discharge method. Surface-gap gets its benefits because the spark takes less voltage to travel a long distance over the surface of the plug then it does to go through the air. This gives you more spark exposure area.

$12.50 (Lexus Dealer)

Torquemaster

Torquemaster

These plugs are very common and come in Platinum or Copper

$3.95 Copper
$1.90 Platinum
(Amazon.com)

Spitfire

Spitfire

This plug seems to be controversial.
It is made by LSG Brisk

Halo

Halo