Denso 3057 Spark Plug

Denso 3057 U-Groove Spark Plug Overview

The Denso 3057 is a conventional spark plug built for steady ignition performance in older gasoline engines. Its U-Groove ground electrode design helps improve ignitability, supporting more complete combustion and consistent engine efficiency in the applications listed below.

Compatible With classic Volkswagen Vanagon, Jeep Grand Wagoneer, Jeep J10, Jeep J20, Nissan 510, and Chevrolet C10 Suburban, C20 Suburban, and K10 Suburban applications, this plug is built around a copper core center electrode, nickel tip materials, and a standard ground configuration. The Denso 3057 is a direct-fit ignition service part for vehicles that call for the specified thread, reach, seat, and heat range dimensions.

Key Features

• U-Groove ground electrode design for improved ignitability
• Conventional spark plug construction for older engine applications
• Copper core center electrode for stable heat transfer
• Nickel center and ground electrode tip materials
• 5000 ohm resistance
• 0.8 pre-gap size
• 14.00 mm thread diameter, 19.00 mm reach, and flat seat type
• Manufacturer heat range 20

Product Details

Denso U-Groove Conventional spark plugs are engineered around a shaped ground electrode that exposes the spark more effectively than a standard flat-edge design. On the Denso 3057, that layout works with a copper core center electrode and nickel electrode tips to support reliable spark delivery in secondary ignition systems. This part is a practical OE-style service choice for vehicles that specify the listed dimensions and heat range, including Volkswagen Vanagon, Jeep Grand Wagoneer, and Nissan 510 applications.

This part cross-references DENSO Auto Parts W20ESR-U and Volkswagen 101 000 009 AA for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn or inefficient spark plugs
• Rough idle from inconsistent ignition firing
• Misfire symptoms related to degraded plug electrodes
• Reduced combustion efficiency from excessive plug wear
• Service replacement needs on older Volkswagen, Jeep, Nissan, and Chevrolet engines

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the vehicle’s service specifications before installation. The Denso 3057 uses a 0.8 pre-gap size, but final gap verification should always be checked against the engine’s required setting. Inspect ignition wires, distributor components, and coil condition during spark plug service to help maintain consistent secondary ignition performance.

Quality Assurance

Built by Denso, a recognized ignition component manufacturer, this spark plug follows the dimensional and material specifications listed for the application. The U-Groove design is intended to improve ignitability and support efficient engine operation in the confirmed fitments.

Compatible Vehicles

• Fits 1983-1991 Volkswagen Vanagon, N/A, U-Groove Conventional
• Fits 1987-1990 Jeep Grand Wagoneer, N/A, U-Groove Conventional
• Fits 1985-1988 Jeep J10, N/A, U-Groove Conventional
• Fits 1985-1988 Jeep J20, N/A, U-Groove Conventional
• Fits 1968-1973 Nissan 510, N/A, U-Groove Conventional
• Fits 1968-1969 Chevrolet C10 Suburban, N/A, U-Groove Conventional
• Fits 1968-1969 Chevrolet C20 Suburban, N/A, U-Groove Conventional
• Fits 1968 Chevrolet K10 Suburban, N/A, U-Groove Conventional