Welding Process
Shock Test
Spark Projection
Warranty
Bosch sparkplug in the workshop

Bosch Double Iridium Spark Plugs

Bosch Double Iridium Spark Plugs are engineered to deliver both high performance and long life, representing advanced original equipment (OE) spark plug technology. The ultra-fine wire design and laser welded tapered ground electrode deliver optimum performance, while the iridium center electrode and ground electrode help it to go the distance. Unlock the performance in your engine with Bosch Double Iridium Spark Plugs.

  • Double Iridium electrodes – iridium firing pin and iridium ground electrode inlay offer higher performance
  • OE Replacement: meets or exceeds manufacturer design requirements for modern gasoline engines to provide OE fit, form and function
  • OE-matched spark position for compatibility with Gasoline Direct Injection (GDI) technology
  • 4X Longer Service Life: compared to standard copper spark plugs
Spark Plug Comparison
Select two products below to compare with Bosch.

Pick two competitor plugs to compare with Bosch.

Center Electrode Welding Process
Center Electrode Primary Base & Tip Material
Ground Electrode Welding Process

Laser Welded Inlay

Bosch

Inlay Intact

Resistance Welded

Competitors

Weld failed, pad missing

Weld failing

Thermal Shock Test
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360˚ Continuous Wave Laser Welding
Competitor Pulse Laser Welding
Competitor Resistance Laser Welding
No welding fractures
No fractures
Fractures in welding zone
Fractures in welding zone
Fractures in welding zone
Fracture in welding zone
Spark Projection
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OE Plug
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Bosch Double Iridium
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NGK Iridium IX
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Denso Iridium Power

The new Bosch Double Iridium was designed to match OE specified spark projection better than any other full Iridium spark plug line.

All plugs shown fit late model GM small block V-8

Professional Technician Warranty