Bosch X5DC Spark Plug

Bosch X5DC Nickel Spark Plug Overview

The Bosch X5DC is a conventional nickel-copper spark plug built for steady ignition performance and value. It uses a nickel center electrode with a copper core and a ceramic insulator to meet or exceed original equipment specifications for nickel-copper spark plug applications.

Compatible with select BMW secondary ignition applications, including 1988-1991 BMW M3, 1988 BMW M5, and 1987-1988 BMW M6. The Bosch X5DC is a direct-fit spark plug choice for drivers maintaining factory-style ignition service intervals on these vehicles.

Key Features

• Part number: Bosch X5DC
• Conventional 4-cycle spark plug design
• Nickel center electrode with copper core for durable spark delivery
• Nickel ground electrode tip with standard ground configuration
• Pre-gapped at 0.7 mm
• Flat seat design with 12 mm thread diameter and 19 mm reach
• Non-projected insulator type with ceramic construction
• Manufacturer heat range 5
• Non-resistor design

Product Details

Bosch Nickel line spark plugs are built for drivers who want OE-style ignition service without unnecessary complexity. The X5DC uses a heavy-duty nickel center electrode with a copper core to support consistent spark delivery and long service life in nickel-copper core applications. Its standard ground electrode layout, flat seat, and 17.5 mm hex size make it a straightforward replacement for the listed BMW fitments. This part number, Bosch X5DC, is engineered around factory-style specifications for secondary ignition service on classic BMW M3, M5, and M6 applications.

This part cross-references no listed aftermarket part numbers for the same application.

Common Issues It Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition output
• Misfire conditions related to aged plugs
• Reduced throttle response from degraded spark quality
• Maintenance replacement for factory-style ignition service

Installation Notes and Tips

• Verify the vehicle application before installation: Fits 1988-1991 BMW M3, N/A; Fits 1988 BMW M5, N/A; Fits 1987-1988 BMW M6, N/A.
• Confirm the specified gap for your engine before installation; listed notes include 0.028 in for BMW M3 and M5 applications and 0.024 in for BMW M6 applications.
• Use the correct torque procedure for the flat-seat design to avoid thread or sealing damage.
• Inspect ignition wires, distributor components, and coil condition during spark plug service.
• Replace plugs as a matched set when servicing the engine.

Quality Assurance

Bosch manufactures this spark plug to meet or exceed original equipment specifications for nickel-copper core spark plug applications. The Bosch Nickel product line focuses on conventional ignition service parts built for dependable fitment and consistent performance in OE-style maintenance.