A-Premium Iridium Platinum Spark Plugs for L4 Engines — Pack of 4, Fine-Wire, 0.044" Gap

A-Premium Iridium Platinum spark plugs (pack of 4) are precision-engineered ignition components for L4 engines that combine an iridium center tip with a platinum core for extended life and consistent combustion.

These fine-wire spark plugs are built to match OEM fitment for a range of GM 4-cylinder engines, offering a 0.044" pre-set gap, 5,000-ohm resistance, and a 14 mm thread diameter. They are designed to deliver dependable spark energy, resist electrode wear, and reduce misfires across a broad set of Chevrolet, GMC, Pontiac, Saturn models and others listed by the manufacturer. The construction emphasizes longevity and stable performance, making them a practical maintenance choice when replacing worn plugs or upgrading to a longer-lasting iridium/platinum option.

Which vehicles and engines will these spark plugs fit?

These A-Premium plugs are intended for many GM inline-four engines across several model years. Confirm compatibility with your vehicle’s engine code, thread size, and reach before ordering.

• Chevrolet: Cobalt (2006–2010), Colorado (2004–2012), HHR (2006–2011), Malibu (2007–2012)
• GMC: Canyon (2004–2012)
• Pontiac & Saturn: G5, G6, Grand Am, Solstice, Aura, Ion, Sky, Vue model years listed
• Reference numbers supported: 91418, ILTR5E11, AI3923, XP3923, 12598004, 12622441, 12625058, 3474

How do these plugs improve engine reliability and maintenance intervals?

The iridium tip combined with a platinum core slows electrode erosion, maintaining gap consistency and spark quality longer than conventional copper plugs. That stability helps reduce misfires, maintains smoother idling, and preserves fuel combustion efficiency over time.

• Durable iridium center tip for extended life
• Platinum core for wear resistance and stable gap
• Recommended replacement interval: 80,000–100,000 miles for optimal longevity

What are the key technical specifications I need to know?

Knowing the mechanical specs ensures correct fit and function for your engine. These plugs are manufactured to common OEM dimensions for the listed vehicles.

• Pre-set gap: 0.044 inches (1.12 mm)
• Resistance: 5000 ohms (suppresses radio interference)
• Hex size: 5/8 inch, Reach: 25.00 mm, Insulator height: 53.00 mm, Thread diameter: 14 mm

How should I install and maintain these spark plugs?

Install using the correct torque for your engine and inspect ignition boots and wires for wear. Proper installation ensures reliable sealing and prevents cross-threading or damage to the cylinder head.

• Hand-start threads, then torque to manufacturer specification
• Use anti-seize only if specified by vehicle maker (many plugs come pre-coated)
• Check ignition coils/boots when replacing plugs to avoid repeated failures

Who is this for? These A-Premium Iridium Platinum spark plugs are a good match for owners and independent technicians who want a longer-lasting replacement than standard copper plugs, while keeping OEM-style fitment for many GM 4-cylinder engines. They suit drivers seeking reduced maintenance frequency and reliable ignition performance for daily-driven cars, light trucks, and sport models from the compatible model years listed above.