What does the BKR8EIX fit?

It is a 14 mm thread plug with 26.5 mm reach and a 5/8-inch hex, a common fitment on many Japanese and other four-cylinder engines. Check your engine's specified plug and heat range before buying.

Is iridium worth it over platinum?

Iridium lasts longer and sparks more easily, which matters most in turbo and high-compression engines. For a stock, low-stress engine a platinum plug does the job for less.

What does the 8 in BKR8EIX mean?

It is NGK's heat range: 8 is a colder plug suited to boosted or high-output engines. A stock engine usually calls for a hotter grade such as 6 or 7.

It comes pre-gapped, and the iridium tip is fragile, so avoid regapping unless your engine spec requires it. Never pry on the center electrode.

How many plugs come in the box?

One plug. A four-cylinder engine needs four.

How often should it be replaced?

NGK rates its iridium plugs for long service intervals, often far beyond nickel plugs. Follow your owner's manual interval, and replace sooner in tuned engines.