Bosch 8119 Spark Plug

Bosch OE Fine Wire Double Platinum Spark Plug 8119

Bosch 8119 is an OE Fine Wire Double Platinum spark plug built for direct replacement service in a wide range of Ford, Mazda, Chevrolet, GMC, Pontiac, Isuzu, Mercedes-Benz, Buick, Oldsmobile, and Mercury applications. It uses platinum on the center electrode and platinum in the ground electrode inlay to reduce gap erosion and support longer service life while maintaining OE specifications.

Key Features

• Double platinum design with platinum center electrode firing pin and platinum ground electrode inlay
• Fine-wire OE-style construction for stable ignition performance
• 6000 ohm resistor for ignition noise suppression
• 14 mm thread diameter, 17.5 mm reach, and tapered seat
• Pre-gapped at 1.1 mm; do not gap before installation where OE notes specify preset gap
• Nickel-yttrium and copper core materials with ceramic insulator
• Compatible with 4-cycle ignition systems

Product Details

The Bosch OE Fine Wire Double Platinum line is built around OE spark plug technology for vehicles that call for a double platinum design. Part number 8119 uses platinum on both the center and ground electrode contact surfaces to help limit wear at the gap, which is important in distributorless ignition systems and other applications that place more demand on the plug. This Bosch 8119 spark plug is a direct-fit service part for many Ford Ranger, Ford F-150, Mazda B2300, Chevrolet S10, GMC Sonoma, and Pontiac Sunfire applications listed in the fitment data.

This part cross-references common OE-style replacement needs for the same application. Use the vehicle-specific fitment notes to confirm whether your application requires a preset gap and whether the original plug material was copper/nickel, platinum, or iridium.

Common Issues This Part Can Address

• Misfire caused by worn or eroded spark plug electrodes
• Hard starting related to weak spark delivery
• Rough idle from inconsistent ignition performance
• Reduced fuel economy from degraded spark plug condition
• Service intervals shortened by standard-plug wear in OE double platinum applications

Installation Notes and Tips

• Follow the vehicle-specific notes in the fitment data; several applications state “Do Not Gap, Gap is Preset.”
• Verify thread diameter, reach, seat type, and heat range before installation.
• Inspect ignition coils, wires, and boots during spark plug service to avoid repeat misfire concerns.
• Use the correct torque procedure for tapered-seat spark plugs to help prevent thread or sealing damage.
• Confirm the engine’s original plug material and OE specification when servicing Ford Ranger, Ford F-150, and Mazda B2300 applications.

Quality Assurance

Bosch manufactures this spark plug to OE Fine Wire Double Platinum specifications, using platinum electrode materials and a resistor design intended to meet original equipment requirements for double platinum spark plugs. The construction supports durability and consistent ignition performance across the listed applications.