Whatever your use or engine set-up, the correct choice of spark plug is very important. Iridium is very heavy and dense metal, ensuring that NGK spark plugs have a longer lifespan than OEM ones, withstanding more than 100.000 km in standard use.
If the letters (for example BKR-EIX) indicate the spark plug's shape and thread size, the numbers (from 7 to 9) indicate the heat range, basically meaning how well the spark plug can operate in intense conditions. The higher the number, the more the spark plug will be "cold", and more adapted to tuned engines and sporty use. A cold spark plug is designed to operate at higher than average temperatures and disperse the heat inside the cylinders, improving combustion, performances and engine reliability, reducing the risk of detonation.
However, make sure you only fit cold spark plugs if your car requires them, otherwise you could encounter problems such as difficult cold starts and rough idling. Also, do not install cold spark plugs if your engine runs on E85 fuel. In short :
Engine Code | 1JZ-GE, 1JZ-GTE, 1ZZ-FE, 2JZ-GE, 2JZ-GTE, 2ZZ-GE, 3S-GE, 3S-GTE, 6G72, 7A-FE, B16, B18, B6-ZE, BP-ZE, C30A, C32B, EJ20, EJ22, EJ25, F20, F22, F4R, FS-19, GA16DE, K3-VE, M16A, M20, M40, M42, M43, M44, M50, M52, M54, M60, M62, N40, N42, N45, N46, N53, N5C, N5D, N5F, N62, N73, RB25DET, S62B50, S70, SR20DE, SR20 |
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Non-exhaustive list.
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