NGK 5245 Spark Plug

NGK Laser Iridium Spark Plug 5245

NGK 5245 is a Laser Iridium spark plug built for precise ignition performance and OE-style fitment. It uses an iridium center electrode tip, a nickel ground electrode, and a 0.024 in pre-gap specification for applications that call for exact factory-style tuning.

Compatible With 2021 Subaru WRX STI and 2019-2020 Subaru WRX STI, this NGK Laser Iridium Spark Plug also matches the 2006 Mitsubishi Lancer application listed by the manufacturer. The ILFR7H design reflects NGK’s OE supplier background and focus on original equipment standards for durability and consistent operation.

Key Features

• Laser Iridium spark plug from NGK’s Laser Iridium line
• Part number 5245; NGK ILFR7H reference
• Iridium center electrode tip for stable ignition performance
• Nickel ground electrode with standard ground configuration
• 0.024 in pre-gap size specified in the product data
• 14 mm thread diameter, 26.5 mm reach, flat seat
• 5/8 in hex size with non-removable nut terminal
• 5000 ohm resistance

Product Details

NGK 5245 is engineered as a Laser Iridium spark plug for vehicles that require a factory-style plug with exact heat range and gap specifications. The tapered-cut ground electrode tip and single-ground-electrode layout support consistent spark delivery, while the copper core and iridium tip materials align with OE-focused ignition service. For shoppers searching for a Subaru WRX STI spark plug or a Mitsubishi Lancer spark plug, this part number 5245 application data provides a direct match to the listed vehicles.

NGK’s manufacturing background includes extensive OE supply experience across domestic and import vehicles, along with coverage for automotive, motorcycle, marine, and small engine applications. This product line is positioned around original equipment standards, making it a practical choice when replacing a worn spark plug with the same style and specification.

This part cross-references Autolite 5245 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire conditions related to plug wear or gap drift
• Reduced throttle response from degraded spark delivery
• Service replacement for OE-spec ignition maintenance intervals

Installation Notes and Tips

• Verify the vehicle application before installation: Fits 2021 Subaru WRX STI, N/A; Fits 2019-2020 Subaru WRX STI, N/A; Fits 2006 Mitsubishi Lancer, N/A.
• Confirm the specified 0.024 in gap before installation if your service procedure requires checking.
• Use the correct 5/8 in spark plug socket and follow the vehicle manufacturer’s torque specification.
• Inspect ignition coils and plug wells during service to help maintain consistent ignition performance.

Quality Assurance

NGK is a long-established OE supplier and manufacturer with a reputation built on original equipment standards, broad vehicle coverage, and controlled manufacturing for ignition components. Part number 5245 is produced to match the listed ILFR7H specification and application data.