552.70
The Bosch FR6LII330X is a Double Iridium spark plug — meaning it uses iridium alloy on both the centre (firing) electrode and the ground electrode for improved ignition performance and durability compared to standard copper or single-iridium plugs.
Key Features:
Double Iridium Electrodes
• Iridium at both electrodes provides stronger, more reliable sparks and excellent ignitability, with improved combustion efficiency and stable performance under demanding conditions.
• Iridium’s high melting point and wear resistance help provide a longer service life — typically several times longer than standard copper plugs.
Precision Design & Construction
• Ultra-fine wire centre electrode and laser-welded ground electrode inlay improve spark consistency and durability.
• Large copper core (in designs that require it) enhances heat transfer and protects against overheating.
• Ribbed ceramic insulator helps prevent flash-over (unwanted spark leakage).
• Nickel-plated body and threads resist corrosion and reduce the need for anti-seize.
• Plugs come factory pre-set with the correct electrode gap, so they’re ready to install without additional gapping.
Performance & Usage
This spark plug is engineered as an OE-quality replacement for vehicles that require an iridium ignition plug. The double iridium design helps maintain consistent spark performance throughout its lifespan, which can result in smoother idle, reliable starts, and better combustion efficiency in compatible engines.
