NGK 4285 Spark Plug

NGK Laser Platinum Spark Plug for Porsche

NGK Laser Platinum Spark Plug 4285 is an OE-style ignition component built for select Porsche applications that call for precise spark delivery and factory-style fitment. It combines a platinum center electrode with a nickel ground electrode design to support consistent ignition performance in the 2003-2008 Porsche 911, Boxster, and Cayman applications listed below.

Key Features

• NGK Laser Platinum Spark Plug, part number 4285
• Platinum center electrode tip for durable spark performance
• Copper center electrode core for efficient conductivity
• Nickel ground electrode core material
• Semi-surface discharge ground electrode design
• 4 ground electrodes
• 5,000 ohm resistance
• 14.00 mm thread diameter, 0.75 in. reach, flat seat
• Pre-gapped to .020 in. from the manufacturer; listed fitment notes specify 0.032 in. gap for the applications shown
• OE-equivalent design for select Porsche 911, Boxster, and Cayman models

Product Details

NGK’s Laser Platinum line is built around OE-focused construction and long service life characteristics for modern ignition systems. Part number 4285 uses a platinum-tipped center electrode, copper core, and semi-surface discharge ground configuration to support stable combustion in the specified Porsche applications. This spark plug is listed for 2003-2006 Porsche 911, 2005-2007 Porsche Boxster, 2006-2007 Porsche Cayman, 2007-2008 Porsche 911, and 2008 Porsche Boxster and Cayman models. This part cross-references BMW OE number 12 12 0 031 708 for the same application.

Common Uses

• Replacing worn spark plugs on Porsche 911 engines with misfire or rough-running symptoms
• Restoring ignition performance in Porsche Boxster models with extended service intervals
• Addressing hard-start or inconsistent idle concerns in Porsche Cayman applications
• Maintaining OE-style ignition output during scheduled tune-up service
• Supporting proper combustion when the original spark plug has reached service life

Installation Notes

Verify the vehicle application before installation and confirm the specified gap for your exact model year. Fitment notes call for a 0.032 in. gap on the listed Porsche applications, even though the plug is pre-gapped to .020 in. from the manufacturer. Use the correct 5/8 in. hex tool and follow the vehicle service procedure for torque and thread engagement. Fits 2003-2006 Porsche 911, N/A; Fits 2005-2007 Porsche Boxster, N/A; Fits 2006-2007 Porsche Cayman, N/A; Fits 2007-2008 Porsche 911, N/A; Fits 2008 Porsche Boxster, N/A; Fits 2008 Porsche Cayman, N/A.

Quality Assurance

NGK is a major OE supplier in North America with more than 80 years of automotive ignition experience. The brand manufactures spark plugs for a wide range of automotive applications and maintains OE-focused production standards for durability and consistent operation.