Bosch 6766 Spark Plug

Bosch OE Fine Wire Platinum Spark Plug 6766

Bosch 6766 is an OE Fine Wire Platinum spark plug built for direct replacement service in a range of Chrysler, Dodge, Jeep, Buick, and Cadillac applications. It uses a fine wire center electrode with a platinum firing pin to support consistent ignition and improved fuel efficiency compared with conventional copper-core plugs.

Key Features

• Fine wire center electrode with platinum tip for improved ignitability
• Tapered ground electrode design for OE-style combustion performance
• Resistor spark plug with 6000 resistance
• Copper core center and ground electrodes for stable heat transfer
• Non-removable nut terminal, 14 mm thread diameter, 16 mm hex
• 1.1 pre-gap, tapered seat, 25 mm reach, heat range 7
• Ceramic insulator and non-projected insulator type

Product Details

The Bosch OE Fine Wire Platinum line is engineered to meet or exceed original equipment specifications for platinum spark plugs. Part number 6766 combines a platinum center electrode tip with a J-gap ground configuration and nickel ground tip material to promote reliable spark delivery and steady engine operation. For drivers searching for a Bosch 6766 spark plug for Jeep Wrangler, Dodge Challenger, or Chrysler 300 service, this OE-style design provides a practical upgrade path from standard copper plugs.

Compatible With select 2021-2025 Jeep Wrangler, 2018-2024 Dodge Durango, 2023 Chrysler 300, 2012-2014 Chrysler 300, 2011-2023 Dodge Challenger, 2012-2023 Dodge Charger, 2022-2023 Jeep Grand Wagoneer, 2012-2021 Jeep Grand Cherokee, 2004-2005 Cadillac CTS, 2005 Cadillac STS, 2004 Buick Rendezvous, and 2004 Cadillac SRX applications.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition performance
• Reduced fuel economy related to degraded spark delivery
• Misfire symptoms tied to aged or fouled plugs
• Loss of throttle response from weak ignition output

Installation Notes and Tips

Verify the vehicle’s engine code and service specifications before installation. Match the tapered seat, 14 mm thread diameter, 25 mm reach, and 1.1 pre-gap to the original plug requirements. Use proper spark plug removal and torque procedures to avoid thread or insulator damage, and inspect ignition coils and boots during service. This part cross-references Bosch OE Fine Wire Platinum applications for the same service needs.

Quality Assurance

Bosch designs this spark plug to OE specifications for platinum applications, with materials and geometry selected for consistent ignition performance and durability in everyday driving conditions.