Denso 5018 Spark Plug

Denso 5018 U-Groove Spark Plug Overview

Denso 5018 is a conventional spark plug built for Chrysler, Dodge, Jeep, and Plymouth applications that call for a 14 mm, flat-seat plug with a 19.00 mm reach. Its U-Groove ground electrode design is engineered to improve ignitability, helping support more efficient combustion in a wide range of V6 and V8 engines.

For drivers searching for a Denso 5018 spark plug for Chrysler 300, Dodge Charger, or Jeep Grand Cherokee service, this part combines a copper center electrode core with nickel tip materials and a 5000 ohm resistor for stable secondary ignition performance.

Key Features

• U-Groove ground electrode design for improved spark exposure
• Conventional spark plug construction for direct replacement service
• 5000 ohm resistor for ignition noise suppression
• Copper center electrode core material for dependable conductivity
• Nickel center and ground electrode tip materials
• Pre-gapped to 0.9 mm
• 14.00 mm thread diameter, 19.00 mm reach, flat seat
• 16.0 mm hex size for standard service tools
• Manufacturer heat range 16

Product Line Details

Denso U-Groove Conventional spark plugs are built around a ground electrode shape that opens the spark path more effectively than a standard flat design. That geometry is used to support cleaner ignition events and consistent engine operation in vehicles that specify this style of plug.

Detailed Description

Denso 5018 is a secondary ignition spark plug designed for direct-fit service in many Chrysler, Dodge, Jeep, and Plymouth models. It is listed for applications including Chrysler 300, Chrysler Sebring, Dodge Charger, Dodge Magnum, Dodge Ram 1500, Jeep Grand Cherokee, and Jeep Wrangler, along with additional coverage across the 1981-2010 model years. This part cross-references Chrysler 5602 7275 and DENSO Auto Parts QJ16HR-U for the same application.

The plug uses a nickel ground electrode tip, nickel center electrode tip, and copper core to support reliable spark transfer. The U-Groove ground electrode design is the defining feature of the Denso 5018 and is intended to improve ignitability for better engine efficiency. With a 0.9 mm pre-gap, 14.00 mm thread diameter, and flat seat, it matches the service requirements of many OE-style ignition systems.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark delivery
• Misfire conditions related to degraded secondary ignition components
• Reduced fuel efficiency from incomplete combustion
• Loss of throttle response in high-mileage ignition service intervals

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the vehicle’s service specification before installation. Confirm the gap is set to the engine requirement if your application calls for a different setting than the 0.9 mm pre-gap. Use the correct 16.0 mm spark plug socket and follow the manufacturer’s torque procedure for the cylinder head material.

Compatible With 2005-2010 Chrysler 300, 2007-2010 Chrysler Sebring, 2008-2010 Chrysler Town & Country, 2006-2010 Dodge Charger, 2005-2008 Dodge Magnum, 1993-2004 Jeep Grand Cherokee, and other listed Chrysler, Dodge, Jeep, and Plymouth applications.

Quality Assurance

Denso is an established OE and aftermarket ignition supplier, and the 5018 is built to the dimensional and material specifications listed for the application. Confirm fitment by year, make, model, and engine requirements before service.