NGK 4288 Spark Plug

NGK Laser Platinum Spark Plug 4288

NGK Laser Platinum Spark Plug 4288 is an OE-style ignition component built for Mercedes-Benz and select Dodge Sprinter applications that call for a 0.032" gap and a flat seat design. It combines a platinum center electrode tip with a copper core and nickel ground electrode materials to support consistent spark delivery and stable engine operation.

The Laser Platinum line is positioned for drivers who want an OE-equivalent spark plug from NGK, a long-time original equipment supplier with broad coverage across domestic and import vehicles. Part number 4288 is also identified as NGK PLKR7A.

Key Features

• Platinum center electrode tip for durable ignition performance
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with standard tip and standard configuration
• Pre-gapped to 0.032" for listed Mercedes-Benz and Sprinter applications
• Flat seat design with 12 mm thread diameter and 5/8 hex size
• 1000 ohm resistance and non-removable nut terminal
• Manufacturer heat range 7

Detailed Description

NGK 4288 is a Laser Platinum spark plug engineered for vehicles that specify OE-equivalent ignition performance, including Mercedes-Benz C250, C300, E350, GL450, ML350, SL550, and related models, plus Dodge Sprinter 2500 and 3500 applications. The platinum tip helps maintain electrode integrity over extended service intervals, while the copper core supports heat dissipation for dependable combustion. This part number 4288 is built to match the listed 0.032" gap and flat-seat configuration used across the fitment range.

This part cross-references Bosch YR7MPP33 for the same application.

What It Is Used For

• Rough idle caused by worn spark plugs
• Hard starting from weak or inconsistent spark output
• Misfire conditions tied to aged ignition components
• Reduced fuel economy from degraded plug performance
• Loss of throttle response in Mercedes-Benz and Sprinter engines

Installation Notes and Tips

Verify the engine application before installation and confirm the specified 0.032" gap matches the vehicle requirements. Use the listed flat seat and 12 mm thread specifications during replacement, and follow the manufacturer service interval for your model year. For Mercedes-Benz G550, C300, E350, GL450, and other listed applications, install according to OE service procedures and torque specifications.

Quality Assurance

NGK is a major OE spark plug supplier in North America with decades of manufacturing experience and broad coverage for automotive applications. The Laser Platinum line reflects NGK’s OE-focused approach to durability and operational consistency for listed Mercedes-Benz and Dodge Sprinter fitments.