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A "normal" or standard NGK spark plug typically refers to their Nickel Alloy series, which is designed to meet or exceed OEM requirements for non-performance engines. These plugs are known for reliability, featuring a copper core for heat dissipation and a 2.5mm traditional center electrode, offering a service life of 10,000 to 20,000 km.
Core Specifications
- Center Electrode Material: Nickel Alloy (with a copper core for superior heat dissipation).
- Center Electrode Diameter: Typically 2.5mm (standard type).
- Service Life: 10,000 – 20,000 km.
- Insulation Resistance: Engine can start normally if the resistance between center electrode and shell is >10 megohms.
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