NGK 91899 Spark Plug

NGK Laser Iridium Spark Plug for Subaru Applications

NGK 91899 is a Laser Iridium High Ignitability spark plug built for OE-style ignition performance and long service life. It uses an iridium center electrode, platinum ground electrode tip, and a fine-wire design to support consistent spark delivery in Subaru engines.

Compatible With select 2019-2024 Subaru Crosstrek, 2019-2023 Subaru Forester, 2020-2024 Subaru Outback, 2020-2023 Subaru Legacy, and 2024 Subaru Forester, Impreza, and Legacy applications. The NGK 91899 spark plug is a direct-fit ignition service part for vehicles calling for service number DILKAR7Q8.

Key Features

• Laser Iridium High Ignitability design for OE application requirements
• Iridium-tipped center electrode for durability and stable spark performance
• Platinum ground electrode tip for even wear in distributorless ignition systems
• Fine-wire center electrode design for efficient ignition response
• Copper core and high-grade ceramic construction to help manage heat
• Resistor type plug with 0.032 in. pre-gap
• Flat seat, M12 x 1.25 thread, 14 mm hex, 1.043 in. reach

Product Details

NGK Laser Iridium High Ignitability spark plugs are engineered for OE applications where consistent ignition, heat control, and durability matter. The iridium center electrode is paired with a platinum ground electrode tip and dual fine electrode layout to promote even wear and reliable spark performance. A pure copper core and alumina ceramic insulator help control operating temperature, while the resistor design supports stable ignition system operation. This NGK 91899 spark plug is a strong match for Subaru Crosstrek, Forester, Outback, Legacy, and Impreza service intervals that specify DILKAR7Q8.

This part cross-references NGK DILKAR7Q8 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition output
• Misfire conditions related to electrode wear
• Reduced throttle response from weak spark delivery
• Service interval maintenance on Subaru ignition systems

Installation Notes and Tips

Verify the engine calls for service number DILKAR7Q8 before installation. Check the pre-gap specification and confirm the plug seat type, thread size, and reach match the original part. Use proper spark plug service procedures to avoid thread damage and ensure correct torque. For Subaru Crosstrek, Forester, Outback, Legacy, and Impreza maintenance, replace plugs only with the specified OE-style equivalent.

Quality Assurance

NGK designs this Laser Iridium High Ignitability spark plug to meet OE application standards and durability expectations. Materials and construction are selected for reliable ignition performance and long service life in the specified Subaru applications.