Bosch 96318 Spark Plug

Reliable Ignition Performance for Subaru Forester and WRX Models

The Bosch OE Fine Wire Double Iridium spark plug (Part Number 96318) is engineered to deliver consistent ignition and efficient combustion for Subaru Forester, WRX, and WRX STI vehicles. Designed with advanced materials and precise specifications, this spark plug supports optimal engine performance and durability.

• Iridium center electrode tip for enhanced durability and ignition
• Copper core ground electrode for improved conductivity
• Standard ground electrode tip and configuration
• Pre-gap size of 0.6 mm for precise spark delivery
• Flat seat type with 14 mm hex size for secure installation
• Manufacturer heat range rating of 6 suitable for 4-cycle engines
• Projected ceramic insulator for reliable insulation and heat dissipation
• Thread diameter of 12 mm and reach of 26.5 mm
• Resistor type spark plug with 6000 ohm resistance to reduce electrical noise

About the Bosch OE Fine Wire Double Iridium Product Line

The OE Fine Wire Double Iridium line from Bosch features spark plugs designed with dual iridium electrodes to provide precise spark control and extended service life. This technology reduces electrode wear and supports consistent ignition performance, making it suitable for demanding applications such as Subaru Forester and WRX models. The combination of iridium and platinum-iridium materials in the electrodes enhances durability and combustion efficiency.

Technical Details and Specifications

The Bosch 96318 spark plug incorporates a copper core ground electrode and a nickel-yttrium and copper center electrode core, ensuring excellent electrical conductivity and heat transfer. The ground electrode tip is made from a platinum-iridium and nickel-yttrium copper alloy, contributing to long-lasting performance. The spark plug features a flat seat design and a projected ceramic insulator that withstands high temperatures and prevents misfires. With a manufacturer heat range of 6 and a pre-gap of 0.6 mm, this spark plug is optimized for 4-cycle Subaru engines requiring precise ignition timing.

Applications and Common Issues Addressed

• Replacement for worn or fouled spark plugs in Subaru Forester, WRX, and WRX STI
• Helps resolve engine misfires and rough idling
• Improves cold start performance and throttle response
• Reduces spark plug electrode wear for longer service intervals
• Minimizes electrical interference with onboard electronics due to resistor design

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 0.6 mm before installation. Use a 14 mm socket wrench for proper tightening to avoid damage to the flat seat. Verify thread diameter (12 mm) and reach (26.5 mm) compatibility with your Subaru model. It is recommended to replace all spark plugs simultaneously to maintain balanced engine performance.

Quality Assurance and Warranty

Bosch OE Fine Wire Double Iridium spark plugs are manufactured to meet OEM standards for fit, form, and function. The use of high-quality materials such as iridium and platinum alloys ensures durability and consistent ignition. While specific warranty details are not provided, Bosch products typically adhere to strict quality control processes to support reliable operation in Subaru Forester and WRX vehicles.