Autolite 255 Spark Plug

Autolite 255 Copper Spark Plug Overview

Autolite Copper Spark Plug 255 is an OE-style replacement spark plug built for quick starts, steady idle quality, improved fuel economy, and smooth acceleration. It uses a copper center electrode with nickel tip materials and a ceramic insulator to support consistent ignition performance in a wide range of foreign and domestic vehicles.

The Copper Spark Plug line focuses on practical replacement value with OE form, fit, and function. For drivers servicing ignition systems on applications such as Honda Civic or Ford F-150, Autolite 255 provides a straightforward spark plug option that matches common factory-style requirements.

Key Features

• Copper center electrode core material for reliable spark delivery
• Nickel center and ground electrode tip materials
• Standard / regular center electrode design
• 0.030 in. pre-gap size for factory-style service applications
• Flat seat design with 14.0 mm thread diameter
• 3/4 in. hex size for common spark plug socket fitment
• Ceramic short insulator for ignition system durability
• Stud electrical terminal type
• Non-resistor design

Detailed Description

Autolite 255 is a copper spark plug engineered as an OE-style service part for engines that call for a 14 mm thread, 0.374 in. reach, flat seat, and 0.030 in. gap. The copper core helps promote dependable ignition response, while the nickel electrode materials support stable wear characteristics in everyday driving. This makes the Autolite 255 a practical choice for routine tune-ups and ignition maintenance where factory-style dimensions matter.

As part of the Autolite Copper Spark Plug line, this plug is positioned as a value-focused replacement for original equipment specifications across many makes and models. If you are servicing a Honda Civic, Ford F-150, or another vehicle that specifies this plug style, Autolite 255 helps restore consistent spark performance without changing the original plug format. This part cross-references Champion Spark Plug 840 for the same application.

What It Helps Address

• Hard starting caused by worn spark plugs
• Rough idle from weak or inconsistent ignition output
• Reduced throttle response during acceleration
• Fuel economy loss related to degraded spark performance
• Misfire symptoms tied to plug wear or incorrect gap

Installation Notes and Tips

Verify the engine calls for a 14.0 mm thread diameter, 0.374 in. reach, flat seat, and 0.030 in. pre-gap before installation. Use the correct 3/4 in. spark plug socket and confirm the terminal style matches the ignition lead or coil-on-plug connection. For best results, inspect the ignition system, check plug wire or coil condition, and follow the vehicle service manual for torque and gap verification.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and this spark plug is built to OE form, fit, and function standards for service replacement use.