A-Premium Iridium Platinum Spark Plugs Pack of 4 for L4 Engines — Fine-Wire, Long-Life

A-Premium Iridium Platinum Spark Plugs (pack of 4) are high-durability, fine-wire ignition plugs engineered for L4 engines to deliver reliable spark, long life, and stable performance across compatible GM, Ford, Jaguar, Land Rover and other models.

These spark plugs combine an iridium center tip with a platinum core for improved wear resistance and consistent ignition. Designed to meet OEM-style dimensions and electrical resistance, the set fits many 4-cylinder engines and replaces several factory part numbers. They’re intended for long service intervals and are a cost-effective upgrade when you need dependable starting, smooth idling, and consistent combustion without OEM pricing.

Will these plugs fit my vehicle?

Compatibility covers a broad range of cars and SUVs from multiple manufacturers—check thread diameter, reach, and hex size against your factory specification. The package replaces common reference numbers and supports many model years listed below; always confirm fit with your vehicle’s service manual or parts diagram.

• Reference numbers covered: 94374, LTR6IX, 94372, LTR6GP8, 90495, LTR6BHX.
• Thread diameter 14.00 mm and reach 25.00 mm match many L4 OEM plugs.
• Hex size 5/8 in and insulator height 52.50 mm for standard removal tools.

How are these plugs built to last?

The center electrode uses iridium for superior hardness, while a platinum core increases thermal stability—together they resist erosion better than standard copper plugs. The specified 5,000 ohm resistance helps protect ignition coils and promotes reliable spark delivery over extended mileage.

• Iridium tip and platinum core reduce electrode wear.
• High-resistance design (5000 ohms) compatible with modern ignition systems.
• Recommended replacement interval: 80,000–100,000 miles under normal use.

What performance or maintenance benefits can I expect?

Expect steady starts, smoother idle, and consistent combustion when plugs are installed correctly and gapped as specified. Because of their fine-wire construction and noble-metal materials, they help maintain ignition efficiency longer than conventional plugs, reducing misfires and rough running caused by electrode degradation.

• Factory-style gap options: 0.032" or 0.036" for correct tuning.
• Fine-wire tip promotes focused spark energy and efficient burn.
• Lower long-term maintenance frequency compared with copper plugs.

Are installation and torque requirements different from stock plugs?

Installation follows standard spark plug procedures—use the correct socket, torque to manufacturer specs, and verify the gap before fitting. Because these plugs share OEM thread and hex dimensions, no special adapters are usually necessary; apply anti-seize sparingly if recommended by your vehicle maker.

• Use 5/8" socket for installation and proper torqueing tools.
• Confirm gap 0.032" or 0.036" per your engine’s requirement before install.
• Replace in sets to maintain consistent performance across all cylinders.

Who this product is for: drivers and mechanics seeking a durable, OEM-compatible spark plug option for 4-cylinder engines across GM, Ford, Jaguar, Land Rover, Mazda, Lincoln, Cadillac and other supported models. It’s a practical choice for owners who prefer extended-change intervals and steadier ignition without moving to specialty or dealer-only parts. If you maintain your vehicle yourself or manage a fleet that values predictable service schedules, these plugs provide an economical balance of longevity and performance.