Autolite 308 Spark Plug

Autolite 308 Copper Resistor Spark Plug

Autolite 308 is a copper resistor spark plug built for quick starts, steady idle quality, and smooth acceleration. It uses a copper center electrode, nickel tip materials, and a 5,000-ohm resistor to support reliable ignition performance in everyday driving.

As part of the Autolite Copper Resistor Spark Plug line, this plug follows OE-style form, fit, and function for a wide range of foreign and domestic vehicles. It is a practical replacement choice for drivers looking for a standard spark plug service part for applications such as Honda Civic and Toyota Corolla maintenance.

Key Features

• Copper center electrode core for dependable ignition transfer
• Nickel center and ground electrode tip materials
• 5,000-ohm resistor design to help reduce electrical noise
• Pre-gapped at 0.034 in. / 0.90 mm
• Flat seat with 14.0 mm thread diameter and 0.374 in. / 9.5 mm reach
• Ceramic insulator with short insulator type
• Removable nut terminal for common ignition wire setups
• OE-style replacement for many import and domestic engine applications

Detailed Description

Autolite 308 spark plug is engineered as a standard replacement ignition component for engines that call for a copper resistor plug with a flat seat and 13/16 in. hex. The tapered ground electrode tip design and single ground electrode support consistent spark delivery, while the copper core helps promote efficient heat transfer during normal operation. For drivers searching for an Autolite 308 spark plug for Honda Civic or Autolite 308 spark plug for Toyota Corolla service, this part matches common OE-style service requirements where this specification is called for.

This part cross-references Champion Spark Plug 592 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Reduced throttle response from aged ignition components
• Misfire conditions related to plug wear or incorrect gap
• Electrical interference concerns in resistor-plug applications

Installation Notes and Tips

Verify thread diameter, reach, seat type, and pre-gap against the vehicle service specification before installation. Use the correct spark plug socket for the 13/16 in. hex and confirm the removable nut terminal matches the ignition lead or coil-on-plug connection style. Check the gap during service if the engine application requires a specific setting.

For fitment-based searches, confirm the exact engine and ignition specification before ordering. This Autolite 308 spark plug is commonly searched for Honda Civic and Toyota Corolla tune-up service where a copper resistor plug with these dimensions is specified.

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 specified applications.