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The NGK ILTR5E11 is a Laser Iridium spark plug built as an OE or equivalent replacement for engines that specify it. It uses a 14 mm thread, 25 mm reach and a tapered seat, with a resistor core and an iridium-tipped center electrode paired with a platinum pad on the ground electrode. That combination is aimed at long service life and steady starts in distributorless ignition systems. Against copper and single-platinum plugs it trades a higher unit cost for durability and less frequent replacement, and it is the plug many owners fit when they want the factory part rather than a cheaper substitute.
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Owners of cars that specify this plug generally report smooth running and long service intervals, and many fit them as the factory replacement. Complaints are mostly about cost and about buying the wrong heat range or reach for their engine.
The NGK Laser Iridium spark plug (ILTR5E11, NGK 91418) is an original-equipment or equivalent replacement plug. This listing is a box of 4. The plugs are engineered for OE applications and tested to NGK's quality and durability standards.
The center electrode has an iridium tip, which is six times harder than platinum. The insulator is made of high-grade pure alumina ceramic, and the core is 98 percent pure copper. This construction keeps the plug from overheating and supports reliable starts.
Most Laser Iridium spark plugs have a platinum pad on the ground electrode. This gives even wear in distributorless ignition systems.
