Subaru uses more than one spark plug brand; NGK and Denso are the primary OEM suppliers used across its engines and markets.
In practice, there isn’t a single brand mandated by Subaru. Replacement plugs should match the engine’s specifications and heat range. Check the owner’s manual, the dealer’s parts catalog, or Subaru’s official service information to confirm which brand and part numbers apply to your vehicle and region. Both NGK and Denso have historically served as OEM options for Subaru, and either can be appropriate when fitted to the correct engine spec.
Brand landscape by engine and market
Subaru’s spark plug branding varies by engine family and geography. The two leading OEM brands that Subaru uses are NGK and Denso, and which one is installed at the factory can depend on the plant and market. The following outlines the general pattern and how to verify for your vehicle.
- NGK: A common OEM supplier for many Subaru engines across multiple markets; their Laser Iridium and Iridium Power lines are widely used in modern engines.
- Denso: Another major OEM supplier used on several Subaru models and in some regions; offerings include Iridium Power and Twin-Tip models.
In practice, Subaru owners should rely on the official specification for their specific vehicle to determine the correct brand, type, and gap requirements.
How to choose the right spark plug for your Subaru
To ensure you select the correct plug, follow these steps before buying replacements.
- Check the owner's manual or Subaru service bulletin for the exact plug specification (brand, heat range, and gap) for your engine code and model year.
- Identify your engine family (EJ, FA, FB, etc.) and your region to confirm which brands were used as OEM where you are buying the parts.
- Buy from reputable brands (NGK or Denso) with the correct heat range and thread size; ensure compatibility with your engine's spark plug type (iridium, platinum, or copper) as recommended.
- Verify the gap on the plugs; many modern plugs come pre-gapped, but if not, adjust to the specified gap using a gap gauge and avoid over-expansion.
After replacement, ensure proper torque, test for misfires, and confirm smooth engine operation.
Summary
Subaru does not designate a single spark plug brand for all its vehicles. The automaker commonly uses NGK and Denso as OEM suppliers, with the exact brand varying by engine family and market. For replacements, always rely on the official specifications for your model, and choose a plug that matches the required heat range, type, and gap. When in doubt, consult your dealer or refer to the Subaru parts catalog to confirm the correct part numbers.