A-Premium Iridium Platinum Spark Plugs — Pack of 8 Fine-Wire for V8 Engines, Long-Life

A-Premium Iridium Platinum Spark Plugs pack of 8 are high-durability, fine-wire ignition plugs engineered to deliver reliable spark performance for many V8 engines and extended service intervals.

These A-Premium plugs combine an iridium-tipped center electrode and a platinum core to offer a durable spark electrode geometry designed for consistent ignition, reduced misfires, and long service life. Supplied in a pack of eight to match V8 firing requirements, these plugs include factory-style dimensions and a 5,000-ohm resistor for EMI suppression. They’re compatible with a broad list of makes and models — from Chrysler and Dodge to Nissan and Hyundai — making them a practical replacement option when original equipment is no longer available or when you want an upgrade that balances life and reliability.

Which vehicles will these spark plugs fit?

These plugs were engineered to match OEM-style thread, reach, and hex dimensions for many V8 gasoline engines. Fitment covers a long list of Chrysler, Dodge, Ram, Jeep, Nissan, Infiniti, Hyundai, and Kia models across multiple years. Always cross-check your vehicle’s OEM reference number and thread specs before purchasing.

• Common compatible lines: Chrysler 300, Dodge Challenger/Charger, Ram 1500/2500/3500, Jeep Grand Cherokee/Commander.
• Nissan fitments include Armada, Titan, Pathfinder, and NV3500 across listed years.
• Luxury and larger sedans: Hyundai Equus, Genesis; Infiniti M45/Q45/QX56/FX45 models.
• Check provided reference numbers (e.g., LFR5AIX-11 and equivalents) for exact match with your engine.

What are the technical specs and why do they matter?

The core materials and mechanical dimensions determine compatibility and longevity. Iridium and platinum combine hardness and corrosion resistance with a fine-wire tip for efficient spark formation, while specific thread, reach, and hex sizes ensure proper sealing and torque characteristics in cylinder heads.

• Center electrode: iridium tip for concentrated spark energy and wear resistance.
• Core electrode: platinum for added durability and extended service life.
• Resistance: 5000 ohms to reduce radio frequency interference with electronics.
• Critical sizes: gap 0.039/0.044 in, hex 5/8 in, reach 26.5 mm, thread 14.00 mm.

How long will these plugs last and when should they be replaced?

Iridium-platinum plugs are built for extended intervals compared with conventional plugs. Replacement intervals depend on driving conditions, engine tune, and fuel quality, but these plugs are designed to perform reliably over many tens of thousands of miles when installed correctly.

• Recommended replacement window: approximately 80,000–100,000 miles under normal driving conditions.
• Inspect earlier if you notice misfires, rough idle, or decreased starting performance.
• Always gap and torque to manufacturer specifications during installation.

Will installation require modifications or special tools?

Installation is straightforward for a mechanically compatible engine but requires proper torque and a spark-plug socket. No special engine modifications are needed when you match the specified reach and thread measurements to your cylinder head.

• Use a 5/8-inch spark-plug socket and a torque wrench to the vehicle manufacturer’s torque spec.
• Confirm gap (0.039–0.044 in) before installation; re-gap only if necessary using the correct gauge.
• Apply anti-seize sparingly only if recommended by the vehicle maker; over-application can affect torque readings.

Who is this for: This A-Premium pack of eight iridium-platinum spark plugs is aimed at owners and technicians of V8-powered cars, trucks, and SUVs who need a dependable, long-life replacement that matches OEM dimensions. It suits DIYers replacing an entire V8 ignition set, fleet managers seeking consistent, serviceable ignition components, and anyone upgrading from standard copper plugs to an extended-life iridium/platinum option. Always verify compatibility with your exact engine reference numbers before ordering.