Best Spark Plugs for Kia and Hyundai: Theta II and Lambda Engines

Kia and Hyundai vehicles have become increasingly popular — and their maintenance needs are the same as any other quality brand. Here's what to use in common Kia and Hyundai engines.

2.4L Theta II GDI (4-cylinder)

The 2.4L Theta II is found in Sonata, Optima, Santa Fe, and Sorento models. NGK Laser Iridium or Champion iridium plugs are recommended for this direct-injection engine. GDI engines can develop carbon buildup on intake valves — fresh plugs at recommended intervals help maintain proper combustion.

2.0L Turbo (Elantra Sport, Optima SX, Stinger base)

The turbocharged 2.0L benefits from quality iridium plugs. NGK Iridium IX is a proven choice for this engine. Service interval: 30,000–40,000 miles (shorter than naturally aspirated due to boost).

3.3L Lambda V6 (Sorento, Cadenza, Stinger)

The 3.3L V6 is a smooth, powerful engine. NGK iridium or Champion Iridium plugs fit well. Service interval: 60,000 miles with iridium.

Find your Kia or Hyundai plugs at Texan Supply with free shipping.