Bosch Double Iridium Spark Plugs — Pack of 4, OE-matched & Pre-gapped for GDI Engines

BOSCH 96339 OE fine wire double iridium spark plugs are high-performance, long-life replacement plugs engineered to match original equipment specifications for modern gasoline engines.

These Bosch double iridium plugs combine an ultra-fine, laser-welded iridium firing pin with an iridium ground-electrode inlay to improve ignitability and durability compared with conventional copper plugs. Pre-gapped at the factory and fitted with nickel-plated rolled threads, they resist corrosion and thread galling, do not require anti-seize, and are designed for direct compatibility with Gasoline Direct Injection (GDI) and other modern gasoline engines.

How do these plugs improve engine ignition performance?

The ultra-fine wire iridium center electrode and matching iridium ground inlay require lower voltage to ignite the air/fuel mixture, which enhances spark consistency and throttle response. Laser-welded construction preserves electrode shape and gap under high heat and stress for sustained performance over many miles.

• 360° laser-welded ultra-fine iridium firing pin for better ignitability
• Reduced voltage requirement — improved spark reliability at varying loads
• Iridium ground inlay increases wear resistance versus copper plugs
• Designed to hold gap stability across long service intervals

Will these replace original equipment (OE) spark plugs on my vehicle?

Yes — Bosch OE Fine Wire Double Iridium plugs are manufactured to meet or exceed OE dimensions and performance parameters, including spark position and fitment for many GDI engines. Always confirm exact part compatibility with your vehicle’s make, model, year and engine code using a fitment tool.

• OE-matched spark position for proper combustion in modern engines
• Pre-gapped at the factory, ready to install out of the box
• Meets manufacturer requirements for fit, form and function
• Compatible with many Chevrolet, Lexus, Nissan, Subaru, Toyota and other vehicles

How do they make installation and future service easier?

Nickel-plated rolled threads resist corrosion, preventing the plugs from seizing in the cylinder head and allowing easier removal at service intervals. Because the threads are plated and the plugs are pre-gapped, anti-seize and gap adjustments are unnecessary, saving time during installation and maintenance.

• Nickel-plated rolled threads resist corrosion and prevent galling
• No anti-seize required — simplifies installation procedure
• Factory pre-gapped — fits without gap adjustment in most applications
• Pack of four provides enough plugs for many four-cylinder engines or a partial service set

What durability and longevity can I expect from these plugs?

Double iridium construction offers significantly greater wear resistance than standard copper or single-precious-metal plugs, helping preserve gap and performance over longer intervals. Bosch rates the design for extended service life, making it suitable for drivers seeking fewer replacements and consistent ignition quality over time.

• Double iridium electrodes for enhanced longevity versus copper plugs
• Laser-welded electrodes resist erosion under high temperatures
• Stable gap retention reduces misfires and inefficient combustion over time
• Compatible with routine service intervals recommended by vehicle manufacturers

Who is this for: The BOSCH 96339 OE Fine Wire Double Iridium spark plugs are intended for vehicle owners and technicians who want OE-level fit and longer-lasting ignition performance — especially those with modern gasoline or GDI engines seeking reliable starts, steady idle, and extended service intervals. Confirm fitment for your specific vehicle before purchase to ensure proper application.