A-Premium Iridium Platinum Spark Plugs 4-Pack for Buick Encore & Chevrolet 1.4L L4 — OEM Fit, Long-Life

A-Premium 4PCS Iridium Platinum spark plugs are replacement ignition parts engineered for Buick Encore and select Chevrolet L4 1.4L models to restore reliable combustion and long service life.

These four spark plugs match OEM-style dimensions and materials—iridium center electrodes with a platinum-enhanced design—so they fit engines that require a 14 mm thread, 0.75 in reach, and a 0.044 in gap. The set is supplied for common GM 1.4L naturally aspirated and turbocharged four-cylinder engines used across Buick and Chevrolet compact models from the 2011–2021 era. Below you'll find clear answers to the most common questions buyers ask about fit, performance, installation, and maintenance.

Will these spark plugs fit my vehicle?

These A-Premium plugs are specified to match GM reference numbers and the physical dimensions required by many 1.4L L4 engines. Verify your car’s OEM part number or consult the vehicle’s service manual to confirm compatibility before purchase.

• Fits Buick Encore model years 2013–2021 with L4 1.4L engines.
• Fits Chevrolet Cruze 2011–2016 (including Cruze Limited 2016) with L4 1.4L.
• Compatible with Chevrolet Sonic 2012–2020 and Trax 2013–2021 L4 1.4L.
• Cross-references: 91039, IFR7X7G, AI3922, XP3922, XS3922, 55576026, 55585517.

What are the key technical specifications and materials?

These plugs use an iridium center electrode and iridium core for the center conductor, combined with platinum-enhanced construction to balance durability and consistent spark performance. The electrical resistance and physical dimensions mirror the OEM-style requirements for reliable installation and operation.

• Center electrode material: iridium; core: iridium.
• Resistance: 5000 ohms; gap size: 0.044 in (factory set).
• Thread diameter: 14.00 mm; reach: 0.75 in; hex size: 5/8 in; insulator height: 53.00 mm.
• Sold as a set of four plugs for four-cylinder engines.

How do these plugs affect maintenance intervals and longevity?

Iridium and platinum electrodes are chosen to extend service life compared with standard copper plugs. While performance varies by driving conditions, these plugs are engineered to reduce wear and maintain stable ignition timing over longer mileages.

• Recommended replacement interval: commonly 80,000–100,000 miles for iridium/platinum types.
• Durable electrode materials resist erosion and preserve gap integrity longer.
• Maintain correct torque and avoid over-tightening when installing to protect threads and ensure proper sealing.

Is installation straightforward for DIY mechanics?

Yes. Installation is typical for spark plugs on modern four-cylinder engines, but observing correct torque and gap settings is important. If unfamiliar with ignition components, refer to a repair manual or have a professional perform the swap.

• Use a 5/8-inch spark plug socket and proper extension to reach the plug well.
• Check and, if necessary, re-gap before installation; plugs arrive factory-set at 0.044 in.
• Apply anti-seize sparingly if recommended by your service manual; torque to OEM specification.

Who is this for? These A-Premium iridium platinum spark plugs are intended for owners and mechanics of Buick Encore and Chevrolet compact models equipped with the L4 1.4L engine who want an OEM-dimension replacement using long-life electrode materials. They suit drivers seeking consistent ignition, extended service intervals, and a cost-effective replacement set for routine tune-ups or mid-life maintenance.