NGK 5648 Spark Plug

NGK Laser Iridium Spark Plug 5648

NGK 5648 is a Laser Iridium spark plug built for precise ignition performance in a wide range of Mercedes-Benz, Maybach, Audi, and Volkswagen applications. With an iridium center electrode tip, copper core construction, and a 0.028" pre-gap, it is specified for OE-style service on vehicles that call for exact heat range and gap control.

Key Features

• Laser Iridium spark plug with iridium center electrode tip for stable ignition performance
• Copper core center and ground electrode construction for efficient heat transfer
• 0.028" pre-gap, 14 mm thread diameter, 0.75" reach, and flat seat design
• 1000 ohm resistance and standard ground configuration
• NGK part number 5648, manufacturer part number IFR6Q-G
• OE-supplier heritage from NGK, a long-time manufacturer of spark plugs for domestic and import vehicles

Product Details

NGK Laser Iridium Spark Plug 5648 is engineered for vehicles that require a precise OE-style spark plug specification, including Mercedes-Benz Maybach S680, S600, S65 AMG, SL65 AMG, CL600, and related applications, as well as select Audi A4, A4 Quattro, A6 Quattro, Cabriolet, and Volkswagen Beetle, Golf, Jetta, and Passat models. The iridium tip supports consistent spark delivery, while the copper core design helps manage combustion heat. This part cross-references Bosch FR7KI332S for the same application.

Common Reasons to Replace

• Hard starting or extended crank time
• Rough idle or inconsistent combustion
• Misfire codes or hesitation under load
• Reduced fuel economy from worn ignition components
• Service replacement for OE-recommended spark plug intervals

Installation Notes

Verify the vehicle-specific gap before installation and follow the application notes listed for each engine. Some Mercedes-Benz and Maybach applications use twin spark or dual plug systems, while select Audi and Volkswagen applications require a different final gap setting than the pre-gap supplied on the plug. Confirm thread diameter, reach, seat type, and heat range before installation. Use the exact fitment notes for your year, make, and model, including Mercedes-Benz S600, Maybach 62, and Volkswagen Passat applications.

Quality Assurance

NGK is a major OE spark plug supplier with more than 80 years of automotive experience and broad coverage across domestic and import vehicle platforms. The brand manufactures to original equipment standards and supports applications used in Mercedes-Benz, Maybach, Audi, and Volkswagen vehicles. Part number 5648 is built to the IFR6Q-G specification for OE-style service.