Bosch Iridium Spark Plugs OE Fine Wire Double Iridium - Pack of 4, Pre-Gapped Long-Life

BOSCH 96302 OE Fine Wire Double Iridium Spark Plugs are high-durability, factory-prepared ignition components designed to improve ignitability and last far longer than standard plugs.

These spark plugs combine an ultra-fine iridium center electrode with an iridium ground inlay and a laser-welded tapered ground electrode to deliver consistent spark performance for modern gasoline engines, including many GDI applications. They come pre-gapped and feature nickel-plated rolled threads that resist corrosion and help prevent seizing during removal—so you can install them quickly without anti-seize compound. Built to meet OE specifications, the BOSCH 96302 is intended as a direct-fit replacement where listed, offering longer life and lower voltage requirements than traditional copper plugs.

How do these plugs improve starting and throttle response?

The ultra-fine iridium firing pin and precise laser-welded tip produce a concentrated, reliable spark that ignites the air/fuel mix more effectively. Lower voltage requirements mean the ignition system works more efficiently, often translating into crisper starts and more consistent throttle feel.

• 360° laser-welded ultra-fine iridium center electrode for stronger ignitability
• Reduced voltage demand—up to ~24% lower in lab comparisons
• Double iridium design maintains spark quality over many more miles

Will these spark plugs fit my vehicle and require special preparation?

BOSCH 96302 is manufactured to OE fit, form, and function for the vehicles listed by Bosch, including many Ford, Lincoln, Mazda, and Mercury models; however, engine variant affects fitment. Each plug arrives pre-gapped at the factory so no gap adjustment is needed before installation, but always confirm compatibility with your vehicle’s fitment tool.

• Factory pre-gapped—ready to install out of the box
• OE spark position matched for GDI and modern gasoline engines
• Verify vehicle and engine application with a parts/fitment checker

How does the construction affect durability and maintenance?

The dual iridium electrodes and durable laser-welded tip extend service life well beyond copper designs, reducing replacement frequency. Nickel-plated rolled threads resist corrosion and minimize galling, which makes future removal easier and eliminates the need to apply anti-seize during installation.

• Iridium center and ground inlay resist wear for longer intervals
• Nickel-plated rolled threads prevent corrosion and thread galling
• Designed to meet or exceed OEM longevity expectations

What performance differences should I expect in everyday driving?

In normal driving, you can expect steadier idle, dependable cold starts, and consistent combustion over time as the iridium electrodes maintain a focused spark. While not a tuning part, these plugs reduce ignition variability and can help preserve fuel efficiency and emissions control systems by maintaining reliable combustion.

• Smoother idle and more reliable cold-start behavior
• Consistent spark energy helps sustain fuel efficiency
• Supports stable combustion across standard driving conditions

Who is this for? The BOSCH 96302 pack of four is intended for owners and technicians who want an OE-quality replacement that balances long service life with reliable day-to-day performance. It’s particularly suitable for drivers of compatible Ford, Lincoln, Mazda, and Mercury models with modern gasoline or GDI engines, fleet vehicles needing dependable parts, and anyone who prefers factory-prepared, pre-gapped spark plugs to simplify installation. Always check vehicle-specific fitment before purchasing to ensure correct application.