NGK 4998 Spark Plug

NGK Laser Platinum Spark Plug 4998

NGK Laser Platinum Spark Plug 4998 is an OE-style ignition replacement built for Chrysler, Dodge, Jeep, and Volkswagen applications that call for precise heat range, stable resistance, and long service life. It uses a platinum center electrode with a nickel ground electrode to support consistent spark performance in daily driving and high-mileage service intervals.

Key Features

• Laser Platinum design with a platinum center electrode tip for durable spark delivery
• Standard ground electrode tip and standard ground configuration
• 10000 ohm resistance for controlled ignition performance
• Copper center electrode core and nickel ground electrode core
• Pre-gapped at .052 inches
• Tapered seat, 14 mm thread diameter, 5/8 hex size, and 25.00 reach
• NGK part number 4998, manufacturer number PLZTR5A-13

Product Details

NGK’s Laser Platinum Spark Plug line is built around OE replacement requirements, with materials and dimensions selected to match factory ignition specifications. This part number 4998 is used in a wide range of Chrysler 300, Dodge Charger, and Jeep Wrangler applications, including twin-spark and OE-equivalent setups. NGK has long supplied original equipment spark plugs for domestic and import vehicles, and this plug reflects that OE-focused engineering approach.

This part cross-references Mopar SPLZTR5A13 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle and misfire conditions from weak ignition output
• Reduced fuel economy tied to inconsistent spark delivery
• Loss of throttle response in high-mileage ignition systems
• Service interval replacement on OE-recommended applications

Installation Notes

Verify the specified gap before installation, since listed applications call for either 0.050 inch or 0.052 inch depending on vehicle and engine configuration. Confirm tapered-seat cylinder head compatibility, thread reach, and heat range before installing NGK 4998. For fitment examples, this plug fits 2006-2011 Jeep Wrangler, 2007-2010 Dodge Charger, and 2015-2017 Dodge Viper applications listed in the catalog.

Quality Assurance

NGK is a major OE spark plug supplier with more than 80 years of automotive manufacturing experience. The brand’s North American and global production and distribution network supports consistent OE-level specifications for ignition service parts.