Bosch 8115 Spark Plug

Bosch OE Fine Wire Double Platinum Spark Plug 8115

Bosch 8115 is an OE Fine Wire Double Platinum spark plug built for steady ignition performance and extended service life. It uses platinum on the center electrode and a platinum inlay on the ground electrode to reduce gap erosion and maintain consistent firing characteristics.

Compatible With select Dodge Ram 1500, Dodge Viper, Jeep Cherokee, Jeep Wrangler, and Chrysler Viper-era applications that call for a preset-gap double platinum plug, Bosch 8115 supports OE-style ignition service for V8 and other 4-cycle engines across a wide range of model years.

Key Features

• Double platinum design with platinum center electrode and platinum ground inlay
• OE Fine Wire Double Platinum product line for OE-style ignition service
• Preset gap; do not gap before installation
• Resistor spark plug with 6000 resistance specification
• Projected ceramic insulator for stable combustion chamber exposure
• 14 mm thread diameter, 19 mm reach, flat seat, 16 mm hex
• Nickel-Yttrium and copper core materials for the center electrode
• Manufacturer heat range 8

Product Details

Bosch’s OE Fine Wire Double Platinum line is engineered around durability and consistent spark delivery. Part number 8115 uses a platinum firing pin on the center electrode and platinum inlay on the ground electrode, a layout that helps limit electrode wear and preserve the preset gap over time. That makes it a practical choice for vehicles that specify a double platinum spark plug, including many Jeep Cherokee, Jeep Wrangler, and Dodge Ram 1500 applications.

This spark plug is built with a projected ceramic insulator, standard ground configuration, and a flat seat for the listed applications. The preset gap should be left unchanged during service. This part cross-references common OE-style double platinum applications where Bosch 8115 is specified for the same engine family.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Misfire conditions related to excessive plug wear
• Loss of fuel efficiency from degraded spark quality
• Service intervals shortened by rapid gap erosion

Installation Notes

• Verify engine application before installation using the vehicle’s service information.
• Do not gap this plug; the gap is preset.
• Use the correct torque procedure for the 14 mm flat-seat design.
• Inspect ignition wires or coil components during spark plug service.
• Confirm the heat range and reach match the original specification.

Quality Assurance

Bosch manufactures this spark plug to meet Original Equipment specifications for double platinum applications. The platinum-on-platinum electrode design is used to improve durability and maintain performance life in the listed fitments, including select Dodge, Jeep, and Chrysler models.