Autolite 3924DP Spark Plug

Autolite Copper Resistor Spark Plug 3924DP

Autolite 3924DP is a copper resistor spark plug built for quick starts, smooth acceleration, and improved fuel economy. This Copper Resistor Spark Plug - Display Pack follows OE-style form, fit, and function for a wide range of foreign and domestic vehicles, including Audi A6 Quattro, Toyota Corolla, and BMW 3 Series applications.

Key Features

• Copper center electrode core for responsive ignition performance
• Nickel center and ground electrode tip materials for dependable spark delivery
• Resistor design with 4,000 ohms resistance to help reduce electrical noise
• Pre-gapped to 0.044 in. / 1.10 mm for common applications
• Flat seat, 14 mm thread diameter, 19.0 mm reach, and 5/8 in. hex size
• Ceramic insulator with mid-projection design
• OE-style replacement for many Audi, BMW, Hyundai, Kia, Subaru, Toyota, Volkswagen, and more

Product Details

The Autolite Copper Resistor Spark Plug - Display Pack is engineered around a standard regular center electrode design with a tapered ground electrode tip. The copper core supports efficient heat transfer, while the nickel firing surfaces help maintain consistent ignition performance in everyday driving. Part number 3924DP is a practical OE replacement choice for drivers servicing older and newer vehicles that call for a conventional copper resistor plug.

Compatible vehicle coverage includes long-tail applications such as Fits 2009-2025 Audi A6 Quattro, N/A; Fits 2000-2008 Toyota Corolla, N/A; and Fits 2001-2005 BMW 325i, N/A. This part cross-references 5612241 and W145T30 for the same application.

Common Uses

• Hard starting or extended crank conditions
• Rough idle caused by worn spark plugs
• Misfire symptoms from aged ignition components
• Reduced throttle response during acceleration
• Routine ignition service on OE-style copper plug applications

Installation Notes

Verify the vehicle’s required plug specification before installation, including thread diameter, reach, seat type, and pre-gap. Autolite 3924DP is pre-gapped to 0.044 in. / 1.10 mm, but final gap should always be checked against the engine’s service specification. Use proper torque procedures and inspect ignition wires or coils during spark plug replacement to help maintain consistent performance.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, with a focus on OE form, fit, and function across a broad vehicle range. Part number 3924DP is built to meet the needs of drivers seeking a conventional copper resistor spark plug for reliable everyday service.