Bosch 0 242 140 521 Double Iridium Spark Plug - 0 242 140 521 ZR6SII3320

The Bosch 0 242 140 521 is a premium double iridium spark plug engineered to deliver both high performance and long life, representing advanced original equipment technology for modern engines. This spark plug is also known by its short code ZR6SII3320 and cross reference number 7430.

Key Features:

• Features an iridium-alloy center electrode firing pin and a laser-welded ground electrode with an iridium alloy inlay for enhanced durability
• Ultra fine wire design and laser welded, tapered ground electrode deliver the ultimate in ignitability and high performance
• Copper core construction with flat seat design, 12mm thread diameter, and 26.5mm reach
• Pre-gapped at the factory and does not require gap adjustment
• 0.7mm electrode gap with 14mm hex size and 23 Nm tightening torque specification

This spark plug is fully compatible with OEM part numbers 004 159 25 03, 004 159 60 03, and 004 159 63 03, along with additional Mercedes-Benz part numbers including 004 159 64 03 and 004 159 81 03. The double iridium construction provides superior performance compared to standard copper spark plugs, with improved ignition efficiency and extended service life. Designed to meet or exceed original equipment specifications for reliable fitment and quality.