Bosch 8147 Spark Plug

Bosch 8147 OE Fine Wire Double Platinum Spark Plug

Bosch 8147 is an OE Fine Wire Double Platinum spark plug built for consistent ignition performance and extended service life. It uses platinum on both the center and ground electrode contact points to help reduce gap erosion and maintain stable firing characteristics over time.

Compatible With Mercedes-Benz applications including G55 AMG, SLR McLaren, SL55 AMG, CL55 AMG, CLS55 AMG, E55 AMG, S55 AMG, and C230 in the listed model years.

Key Features

• OE Fine Wire Double Platinum design for steady spark delivery
• Platinum firing pin on the center electrode
• Platinum inlay on the ground electrode
• Fine wire center electrode design for precise ignition response
• Resistor spark plug with 6000 ohm resistance
• 14 mm thread diameter, 16 mm hex size, flat seat
• Ceramic insulator with non-projected tip style
• Pre-gapped to .8 mm

Product Details

The Bosch OE Fine Wire Double Platinum line is built around original-equipment spark plug engineering. On Bosch 8147, the platinum center electrode tip and platinum ground electrode tip work together to slow wear at the firing surfaces, helping preserve ignition consistency as mileage accumulates. The copper core construction supports heat transfer, while the resistor design helps control electrical noise in the ignition system. This spark plug is a direct-fit style for select Mercedes-Benz performance and luxury models, including Mercedes-Benz G55 AMG and Mercedes-Benz SL55 AMG applications listed in the fitment data.

This part cross-references Bosch 8147 for the same application.

What It Helps Address

• Misfires caused by worn spark plug electrodes
• Hard starting from weak or inconsistent spark output
• Rough idle related to degraded ignition performance
• Loss of throttle response from aged plugs
• Increased plug wear from repeated heat cycling

Installation Notes

Verify thread diameter, reach, seat type, and heat range before installation. Bosch 8147 uses a 14 mm thread, 26.5 mm reach, flat seat, and 16 mm hex, so confirm the cylinder head specification matches before service. Check the gap against the vehicle service specification before installing, even though the plug is pre-gapped at .8 mm. Use proper spark plug socket tooling and torque to the manufacturer’s specification for the engine.

Quality Assurance

Bosch builds 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 demanding ignition systems.

• Fits 2005-2011 Mercedes-Benz G55 AMG, N/A
• Fits 2005-2009 Mercedes-Benz SLR McLaren, N/A
• Fits 2003-2008 Mercedes-Benz SL55 AMG, N/A
• Fits 2003-2006 Mercedes-Benz CL55 AMG, N/A
• Fits 2006 Mercedes-Benz CLS55 AMG, N/A
• Fits 2003-2006 Mercedes-Benz E55 AMG, N/A
• Fits 2003-2006 Mercedes-Benz S55 AMG, N/A
• Fits 2003-2005 Mercedes-Benz C230, N/A