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The NGK 92145 (LZFR5CI11) is a single iridium spark plug built as original equipment for specific engines. Its 0.6mm fine-wire iridium center electrode and platinum ground pad are made for strong ignitability and long service life, and it is a direct-fit replacement for the applications NGK lists. It suits owners doing scheduled maintenance who want the plug the engine was engineered around. Compared with standard nickel or platinum plugs, it trades a higher upfront cost for longer change intervals and steadier wear in waste-spark ignition systems.
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Owners and mechanics generally rate NGK iridium plugs highly for smooth idle, easy starting and long life, and this part is widely used as an OE replacement. Complaints center on cost and on counterfeit or damaged plugs from untrusted sellers.
The NGK Laser Iridium spark plug (92145) is engineered to original-equipment standards for specific vehicle applications. It has a fine-wire iridium center electrode. The iridium tip is six times harder than platinum.
The ground electrode is platinum. On most Laser Iridium plugs, a platinum pad on the ground electrode helps the plug wear evenly in DIS ignition systems. This plug has a long-projection insulator and an extended-projection center electrode, and it includes a 5k ohm resistor.
