Bosch 8108 Spark Plug

Bosch OE Fine Wire Double Platinum Spark Plug

Bosch 8108 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 Ford, Lincoln, Mazda, Mercury, Chevrolet, Buick, Cadillac, Oldsmobile, Pontiac, and Mazda applications, including Ford Focus, Ford Escape, and Mazda 3 fitments listed below. Bosch 8108 follows original-equipment double platinum specifications for vehicles that call for a tapered-seat, preset-gap spark plug.

Key Features

• Double platinum design with platinum center electrode and platinum ground-electrode inlay
• Fine-wire OE-style construction for consistent ignition performance
• Preset 1.3 mm gap; do not gap before installation
• Resistor spark plug with 6000 ohm resistance
• Tapered seat, 14 mm thread diameter, 17.5 mm reach, 16 mm hex
• Ceramic insulator with non-projected tip design
• Nickel-Yttrium and copper core materials for stable operation

OE Fine Wire Double Platinum Line

Bosch OE Fine Wire Double Platinum plugs are built around original-equipment spark plug technology. The double platinum construction helps control electrode wear, which supports longer service life and more stable gap retention in engines that specify platinum-on-platinum ignition components. Bosch 8108 is a direct-fit style spark plug for vehicles that require this OE configuration.

Detailed Description

Bosch 8108 spark plug is engineered for drivers servicing ignition systems on vehicles such as Ford Transit Connect, Ford Fusion, Ford Crown Victoria, and Mercury Milan applications listed in the fitment data. The platinum firing pin on the center electrode and platinum inlay on the ground electrode help reduce erosion at the firing surfaces, which supports consistent spark delivery over time. The plug is a resistor type with a preset gap, so installation should follow the vehicle specification without adjustment.

This part cross-references NGK (e.g., 7092, 7093) for the same application.

Common Issues This Plug Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark delivery
• Misfire conditions related to excessive gap wear
• Reduced fuel efficiency from weak ignition performance
• Service intervals shortened by standard-plug electrode erosion

Installation Notes and Tips

• Do not gap this spark plug; the gap is preset from the factory.
• Verify tapered-seat and 14 mm thread specifications before installation.
• Use the correct torque procedure for the cylinder head material and engine application.
• Inspect ignition coils, boots, and wires during spark plug service to avoid repeat misfire concerns.
• Confirm the exact year, make, and model against the fitment list before ordering.

Quality Assurance

Bosch manufactures this spark plug to meet original-equipment double platinum specifications for the listed applications. The OE Fine Wire Double Platinum design is built for durability, stable performance, and fitment accuracy in supported vehicles.

Compatible Vehicles

• Fits 2010-2013 Ford Transit Connect, N/A
• Fits 2009-2012 Ford Escape, N/A
• Fits 2010-2012 Ford Fusion, N/A
• Fits 2009-2011 Ford Crown Victoria, N/A
• Fits 2005-2011 Ford Focus, N/A
• Fits 2011 Ford Ranger, N/A
• Fits 2009-2011 Lincoln Town Car, N/A
• Fits 2009-2011 Mazda Tribute, N/A
• Fits 2009-2011 Mercury Mariner, N/A
• Fits 2010-2011 Mercury Milan, N/A
• Fits 2009-2010 Ford F-150, N/A
• Fits 2009-2010 Mercury Grand Marquis, N/A
• Fits 2005-2008 Ford Escape, N/A
• Fits 2008 Mazda Tribute, N/A
• Fits 2005-2006 Mazda Tribute, N/A
• Fits 2005-2008 Mercury Mariner, N/A
• Fits 2004-2007 Ford Freestar, N/A
• Fits 2006-2007 Mazda 5, N/A
• Fits 2004-2005 Mazda 3, N/A
• Fits 2003-2005 Mazda 6, N/A
• Fits 2004 Ford Focus, N/A
• Fits 1998-2004 Ford Mustang, N/A
• Fits 1996-2003 Ford Windstar, N/A
• Fits 1995-2002 Chevrolet Cavalier, N/A
• Fits 2001-2002 Oldsmobile Aurora, N/A
• Fits 1995-1999 Oldsmobile Aurora, N/A
• Fits 1999-2002 Oldsmobile Intrigue, N/A
• Fits 1995-2002 Pontiac Sunfire, N/A
• Fits 1999-2001 Oldsmobile Alero, N/A
• Fits 1995-2001 Pontiac Grand Am, N/A
• Fits 1995-1999 Cadillac DeVille, N/A
• Fits 1995-1999 Cadillac Eldorado, N/A
• Fits 1995-1999 Cadillac Seville, N/A
• Fits 1997-1999 Chevrolet Malibu, N/A
• Fits 1995-1998 Buick Skylark, N/A
• Fits 1995-1998 Oldsmobile Achieva, N/A
• Fits 1996-1997 Chevrolet Camaro, N/A
• Fits 1996-1997 Chevrolet Express 2500, N/A
• Fits 1996-1997 Ford Aerostar, N/A
• Fits 1997 Ford E-150 Econoline, N/A
• Fits 1997 Ford E-150 Econoline Club Wagon, N/A
• Fits 1997 Ford E-250 Econoline, N/A
• Fits 1997 Ford F-150, N/A
• Fits 1994-1997 Mazda B4000, N/A
• Fits 1996 Buick Roadmaster, N/A
• Fits 1996 Cadillac Commercial Chassis, N/A
• Fits 1996 Cadillac Fleetwood, N/A
• Fits 1996 Chevrolet Caprice, N/A
• Fits 1992-1996 Chevrolet Corvette, N/A
• Fits 1996 Chevrolet Impala, N/A
• Fits 1996 Ford Explorer, N/A
• Fits 1990-1995 Ford Aerostar, N/A
• Fits 1991-1995 Ford Explorer, N/A
• Fits 1990-1995 Ford Ranger, N/A
• Fits 1993-1994 Mazda Navajo, N/A
• Fits 1991-1992 Mazda Navajo, N/A