Bosch 8141 Spark Plug

Bosch OE Fine Wire Double Platinum Spark Plug 8141

Bosch 8141 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 help reduce gap erosion and maintain consistent firing characteristics over time.

Compatible With select Mercedes-Benz, Volvo, Chrysler, Land Rover, Subaru, and Mitsubishi applications, this Bosch spark plug is a direct-fit secondary ignition service part for vehicles such as the Mercedes-Benz SLK55 AMG, Volvo XC90, and Subaru Legacy. The OE Fine Wire Double Platinum design follows original equipment specifications for double platinum spark plugs.

Key Features

• Part number 8141 Bosch spark plug for secondary ignition service
• Double platinum construction with platinum center and ground electrode contact points
• Fine wire center electrode design for consistent spark delivery
• Resistor type spark plug with 6000 resistance
• 14 mm thread diameter, 19 mm reach, flat seat, and 16 mm hex size
• Ceramic insulator with non-removable nut terminal
• Standard J-gap ground configuration with pre-gap size of 1
• OE Fine Wire Double Platinum line for OE-style fit and function

Product Details

Bosch 8141 is engineered around OE spark plug technology, using platinum at both the firing and ground contact points to slow electrode wear and help preserve the gap over time. The fine wire center electrode supports reliable ignition performance, while the resistor design helps control electrical noise in the ignition system. This spark plug is a practical choice for drivers servicing vehicles that call for a double platinum OE-style plug, including Mercedes-Benz C32 AMG, Mercedes-Benz CLK55 AMG, Volvo S80, and Subaru Forester applications listed in the fitment data.

This part cross-references Bosch 8141 for the same application.

What It Helps Address

• Misfire concerns related to worn spark plug electrodes
• Hard starting caused by degraded ignition performance
• Rough idle from inconsistent spark delivery
• Reduced fuel economy linked to aging spark plugs
• Service intervals where OE-style double platinum plugs are specified

Installation Notes and Tips

Verify the vehicle’s engine code and spark plug specification before installation. Confirm the 14 mm thread diameter, 19 mm reach, flat seat, and 16 mm hex size match the original plug requirements. Inspect ignition coils, boots, and plug wells during service, and apply proper torque according to the vehicle manufacturer’s service information. For fitment examples, Bosch 8141 is listed for 2006-2011 Mercedes-Benz SLK55 AMG, 2005-2011 Volvo XC90, and 1998-1999 Subaru Impreza.

Quality Assurance

Bosch designs the OE Fine Wire Double Platinum line to meet original equipment specifications for double platinum spark plugs. The platinum-on-platinum electrode design is used to improve durability and maintain performance life in normal ignition service.