Autolite AP3923 Spark Plug

Autolite Platinum Spark Plug AP3923

Autolite Platinum Spark Plug AP3923 is built for drivers who want OE-style ignition performance with platinum durability. It is engineered for easier starts, quicker acceleration, and improved fuel economy, while maintaining the form, fit, and function expected in a direct replacement spark plug.

Compatible With a wide range of Audi, Volkswagen, Mercedes-Benz, Mitsubishi, Toyota, and other import and domestic applications, this spark plug is a practical choice for routine tune-ups and ignition service. The AP3923 part number is commonly searched for fitment on vehicles such as the Audi A4, Volkswagen GTI, and Mitsubishi Outlander Sport.

Key Features

• Platinum center electrode tip and core for added durability versus standard copper plugs
• OE-style fitment and dimensions for direct replacement use
• 0.044 in. pre-gap for applications specified at 1.1 mm
• Resistor design with 4000 ohm resistance
• Ceramic insulator with mid-projection design for stable ignition performance
• 5/8 in. hex, 14 mm thread diameter, and flat seat configuration
• Nickel ground electrode with tapered tip design

Product Details

Autolite Platinum Spark Plug AP3923 is part of the Platinum Spark Plug line, which focuses on longer service life and consistent ignition performance in OE replacement applications. Autolite positions this line as a value-oriented alternative to original equipment spark plugs, with the same basic form and fit expected across many foreign and domestic vehicles. This part cross-references Bosch FGR8KQE0 and Champion Spark Plug 344 for the same application.

Fitment coverage includes 2020-2026 Mitsubishi Outlander Sport, 2019-2025 Mitsubishi RVR, 2015-2018 Audi Q3, 2006-2014 Volkswagen GTI, 2011-2017 Audi Q5, and 2006-2013 Mercedes-Benz S600 applications, among many others. The AP3923 part number is also used across Audi A4, Volkswagen Tiguan, and Mitsubishi Lancer service listings where the specified gap and plug style match.

Common Issues This Plug Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark delivery
• Reduced throttle response during acceleration
• Fuel economy loss related to aged ignition components
• Misfire symptoms tied to plug wear or incorrect gap condition

Installation Notes and Tips

• Verify the vehicle-specific gap specification before installation; many listed applications call for 0.044 in. or 0.032 in. depending on engine design.
• Check the service information for vehicles that require two spark plugs per cylinder.
• Confirm thread diameter, reach, seat type, and terminal style against the original plug before installation.
• Use proper torque procedures to avoid thread damage or sealing issues.
• For best results, replace plugs as a complete set during scheduled ignition service.

Quality Assurance

Autolite is a long-established ignition supplier serving the automotive aftermarket and original equipment manufacturers. AP3923 is manufactured to OE-style standards for fit and function, with platinum construction selected to support durability in demanding daily driving conditions.