The Truth About 10 Popular Spark Plug Brands

6. E3 – High-Tech, Eco-Minded Design

A newer brand founded in 1997, E3 went a different route by redesigning the electrode itself. Their DiamondFire design aims to improve combustion and reduce emissions. Though originally aimed at racing and performance markets, E3 plugs are now widely used—and widely praised—with strong online reviews to back them up.