Bosch 9783 Spark Plug

Bosch OE Fine Wire Iridium Spark Plug 9783

Bosch 9783 is an OE Fine Wire Iridium spark plug built for precise ignition performance and long service life. It uses an ultra-fine iridium center electrode, a platinum ground tip, and a resistor design to support stable spark delivery in high-output engines.

Compatible With Mercedes-Benz Maybach S680, Maybach S650, S65 AMG, G65 AMG, SL65 AMG, S600, CL600, CL65 AMG, SL600, and Maybach 57/62 applications, plus the 2011 Chevrolet Volt. This Bosch spark plug is a direct-fit secondary ignition service part for select 4-cycle engines.

Key Features

• OE Fine Wire Iridium line for OE-style ignition performance
• Iridium center electrode tip with fine-wire design for consistent firing
• Platinum ground electrode tip with standard J-gap configuration
• Resistor spark plug with 6000 resistance specification
• 14 mm thread diameter, 19 mm reach, flat seat, and 16 mm hex
• Pre-gapped to .7 for select factory applications
• Ceramic insulator and non-removable nut terminal

Product Details

Bosch 9783 is engineered around OE spark plug technology for engines that require a fine-wire iridium firing pin and precise heat control. The copper core construction, non-projected insulator, and manufacturer heat range 7 support stable combustion characteristics in demanding ignition systems. For drivers servicing Mercedes-Benz S600, CL600, SL600, S65 AMG, or Maybach 57 and 62 models, this plug matches the fitment and electrical requirements listed for those applications.

The Bosch OE Fine Wire Iridium product line focuses on factory-style fit, reliable spark delivery, and long service intervals in modern performance and luxury vehicles. Part number 9783 is also listed for the 2011 Chevrolet Volt, making it a fitment-specific replacement for select applications rather than a universal plug.

Common Issues This Part Can Address

• Misfire caused by worn or eroded spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Rough idle related to degraded spark quality
• Reduced throttle response from aged secondary ignition components
• Service replacement for plugs that no longer meet factory gap and heat specifications

Installation Notes and Tips

Verify engine application, thread diameter, reach, seat type, and heat range before installation. Bosch 9783 uses a flat seat, 14 mm thread, 19 mm reach, and 16 mm hex, so correct application matching is important for Mercedes-Benz Maybach S680, Maybach S650, S65 AMG, G65 AMG, SL65 AMG, S600, CL600, CL65 AMG, SL600, Maybach 57/62, and 2011 Chevrolet Volt listings. Check the existing plug specification and confirm the gap requirement against the vehicle service information before installation.

Quality Assurance

Bosch manufactures this spark plug as part of its OE Fine Wire Iridium line, using iridium and platinum electrode materials for factory-style ignition service in select high-performance and luxury engines. Part number 9783 is built to the published specifications shown here for direct replacement use in the listed applications.