Autolite APP25 Spark Plug

Autolite Double Platinum Spark Plug Overview

The Autolite Double Platinum Spark Plug APP25 is engineered for reliable ignition performance in a wide range of vehicles including Chevrolet, Ford, and GMC models. Designed with durable platinum electrodes and a tapered ground electrode tip, this spark plug ensures consistent spark and efficient combustion.

• Double platinum center and ground electrode tips for extended durability
• Tapered ground electrode design with nickel core for improved ignition
• Standard electrical stud terminal for secure connection
• Ceramic mid-projection insulator for enhanced heat dissipation
• Pre-gapped to 0.044 inches (1.10 mm) for optimal spark gap
• 16 mm (5/8") hex size for easy installation
• Tapered seat type with 14 mm thread diameter and 11.0 mm reach
• Built-in 4000 ohm resistor to reduce radio frequency interference

Detailed Product Features and Specifications

The Autolite APP25 spark plug features a double platinum design, with both the center and ground electrode tips made from platinum. This design enhances electrode life and maintains consistent spark performance over time. The ground electrode has a tapered tip and a nickel core, which supports reliable ignition and durability under various operating conditions. The spark plug includes a ceramic insulator with a mid-projection type, which helps manage heat and prevents misfires. The plug is pre-gapped to 0.044 inches (1.10 mm), ensuring optimal spark gap for efficient combustion. Its 16 mm (5/8") hex size and 14 mm thread diameter with an 11.0 mm reach make it compatible with many domestic vehicles.

About the Double Platinum Spark Plug Line

The Autolite Double Platinum Spark Plug line is designed to provide longer service life and consistent ignition performance by utilizing platinum on both the center and ground electrodes. This reduces electrode wear and maintains a stable spark gap, which is critical for vehicles requiring reliable secondary ignition components. The APP25 is part of this line, offering a balance of durability and performance for various Buick, Chevrolet, Ford, and GMC models.

Compatible Vehicles and Applications

• Compatible with Chevrolet Camaro, Impala, and Silverado models
• Fits Ford F-150, Bronco, and Mustang vehicles
• Suitable for GMC Sierra and Yukon series
• Also compatible with Buick Regal and Pontiac Grand Prix
• Designed for use in Dodge and Lincoln models listed in fitment

Common Issues Addressed by Autolite APP25 Spark Plug

• Engine misfires due to worn or fouled spark plugs
• Reduced fuel efficiency from inconsistent ignition
• Hard starting or rough idling conditions
• Excessive emissions caused by incomplete combustion
• Ignition interference from radio frequency noise

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.044 inches (1.10 mm) as specified. Use a 16 mm (5/8") socket wrench for proper tightening. Ensure the tapered seat is clean and free of debris to maintain a secure fit. Avoid over-tightening to prevent thread damage. The stud-type electrical terminal requires a compatible ignition wire connection for optimal performance.

Quality Assurance and Warranty

Autolite spark plugs are manufactured to meet OEM specifications and undergo rigorous quality control testing. The APP25 includes a built-in 4000 ohm resistor to minimize radio frequency interference, ensuring compliance with emission and ignition standards. While specific warranty details are not provided, Autolite products typically come with manufacturer-backed quality assurance for fit and function.