Bosch 8187 Spark Plug

Bosch OE Fine Wire Double Platinum Spark Plug

Bosch 8187 is an OE Fine Wire Double Platinum spark plug built for direct replacement service in select BMW and Saab applications. It uses platinum on both the center and ground electrodes to reduce gap erosion and maintain stable ignition performance over time.

The Bosch OE Fine Wire Double Platinum line focuses on original-equipment style construction, with a fine-wire center electrode, platinum firing pin, and platinum inlay at the ground electrode. That combination supports consistent spark delivery and long service life in engines that call for a double platinum plug.

Key Features

• Part number 8187
• Double platinum design with platinum center electrode tip and platinum ground electrode tip
• Fine wire center electrode for precise spark delivery
• Resistor spark plug with 6000 resistance
• 14 mm thread diameter, 16 mm hex size, flat seat
• Ceramic insulator and non-removable nut terminal
• J-gap ground configuration with standard ground electrode tip design
• Manufacturer heat range 7 and 26.5 reach

Detailed Description

Bosch 8187 is engineered for vehicles that specify a double platinum spark plug, including many BMW 128i, 328i, 528i, X3, X5, Z4, and Saab 9-3 applications. The fine wire center electrode and platinum surfaces help resist wear at the gap, which is important in engines that place a premium on ignition consistency and plug longevity. If you are replacing worn plugs in a BMW 328i or Saab 9-3, this OE-style plug matches the type of construction commonly used in those factory applications.

Bosch’s OE Fine Wire Double Platinum product line is built around original-equipment specifications, using platinum on both electrodes rather than a single precious-metal tip. That design helps maintain the plug gap over time and supports steady combustion performance in daily driving and higher-mileage service intervals. Part number 8187 is a direct-fit style spark plug for the listed applications and should be matched to the vehicle’s required plug specification.

What It Helps Address

• Misfires caused by worn or eroded spark plug electrodes
• Hard starting related to weak ignition output
• Rough idle from inconsistent spark delivery
• Reduced fuel economy from degraded ignition performance
• Service issues in BMW and Saab engines that require double platinum plugs

Installation Notes and Tips

Verify the engine’s required spark plug specification before installation, including thread diameter, reach, seat type, and heat range. Bosch 8187 uses a 14 mm thread, flat seat, 16 mm hex, and 26.5 reach. Check and confirm the pre-gap against the vehicle service information before installing, and torque the plug to the manufacturer’s specification for the engine.

Compatible With 2006 BMW 325i, N/A; 2006 BMW 325xi, N/A; 2006 BMW 330i, N/A; 2006 BMW 330xi, N/A; 2006-2007 BMW 525i, N/A; 2006-2007 BMW 525xi, N/A; 2006-2007 BMW 530i, N/A; 2006-2007 BMW 530xi, N/A; 2006-2010 BMW Z4, N/A; 2006-2009 Saab 9-3, N/A; 2007-2010 BMW 328i, N/A; 2007-2010 BMW X3, N/A; 2007-2010 BMW X5, N/A; 2007-2008 BMW 328xi, N/A; 2008-2010 BMW 128i, N/A; 2008-2010 BMW 528i, N/A; 2008 BMW 528xi, N/A; 2009-2010 BMW 328i xDrive, N/A; 2009-2010 BMW 528i xDrive, N/A.

Quality Assurance

Bosch manufactures this spark plug to OE-style specifications for the listed applications, with platinum electrode construction intended to support durability and consistent ignition performance. Part number 8187 is built for direct replacement use in the confirmed BMW and Saab fitments shown above.