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The NGK ILKAR8H6 is the OEM-spec laser iridium plug for the 2015-2021 Subaru WRX and 2014-2018 Forester, sold as a set of four. It pairs an iridium center electrode with a platinum ground tip, a copper core and a 5 kOhm resistor, and NGK rates it for up to 100,000 miles. That makes it a direct-fit replacement for turbocharged FA and FB Subaru engines rather than a universal plug. Owners report smooth running after swapping all four, and the main caveat is checking the gap before install.
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Buyers rate these highly and describe clean installs on a 2018 WRX with the engine running smoother afterward. The recurring advice is to confirm the gap before fitting, and one owner changes plugs more often than the OEM schedule.
These NGK Laser Iridium spark plugs (part number ILKAR8H6) are an OEM-equivalent replacement for turbocharged Subaru engines. They fit the 2015-2021 Subaru WRX and the 2014-2018 Subaru Forester. They are sold as a set of 4.
Each plug has an iridium center electrode tip over a copper core, which helps remove heat. The ground electrode is nickel. The insulator is pure alumina silicate ceramic for strength and heat transfer, with corrugated ribs to prevent flashover. Triple seals prevent leakage.
Always check the gap before installing.
