The Bosch 9652 Double Iridium Spark Plug is designed for superior strength and longevity. With its ultra-fine wire design and laser-welded tapered ground electrode, this plug delivers exceptional performance and ignition capability.

Key Features

  • Double iridium firing pin and ground electrode
  • OE Fine Wire design
  • 4-year satisfaction guarantee

Features and Specs for Each Model

  • Double Iridium construction
  • Thread size: 14mm
  • Hex size: 5/8″ (16mm)


  • High ignitability
  • Improved throttle response
  • 4-year guarantee


  • Slightly expensive

Amazon Customer Review

★★★★ “The spark plugs are working great. The 4-year guarantee is a nice addition!” – Robert L.


The Bosch 9652 Double Iridium Spark Plug provides exceptional durability and performance. Though a bit on the expensive side, the 4-year satisfaction guarantee makes this a less risky investment.