Bosch FB581 Fine Wire Platinum Spark Plug

The Bosch FB581 is a Fine Wire Platinum Spark Plug engineered to deliver reliable ignition performance and extended service life. Featuring a fine-wire platinum center electrode, this plug provides a more focused spark that promotes complete combustion for improved throttle response, fuel efficiency, and reduced emissions compared to conventional copper plugs.

Manufactured to OE-equivalent standards, the Bosch FB581 is pre-gapped at the factory and designed for direct, no-hassle installation. The platinum center electrode resists wear and maintains a stable electrode gap over time, helping to extend service intervals.

Key Features:

• Fine-wire platinum center electrode for a focused, consistent spark
• 14mm thread diameter with standard 5/8" hex for easy installation
• Factory pre-gapped — no gap adjustment required in most applications
• Heat range 5 — suitable for a wide range of engine applications
• Nickel-plated steel shell resists corrosion and aids in removal
• Engineered to OE fit, form, and function specifications
• Helps maintain fuel economy and reduce exhaust emissions

The Bosch FB581 is a dependable replacement spark plug built with the same quality standards Bosch uses in original equipment supply. It provides long-lasting ignition performance in a broad range of gasoline-powered engines.