Autolite HT15 Spark Plug

Reliable Ignition Performance for Ford and Lincoln Vehicles

The Autolite Platinum Spark Plug HT15 is engineered to deliver consistent ignition performance for select Ford and Lincoln models. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Platinum center electrode tip for enhanced durability
• Fine wire copper core center electrode for improved conductivity
• Tapered ground electrode tip made of nickel for stable spark
• Extra-long special ceramic insulator for heat resistance
• Resistor type with 5000 ohms resistance to reduce electrical noise
• Compatible with Ford Expedition, F-150, F-250 Super Duty, F-350 Super Duty, Mark LT, Mustang, and Lincoln Navigator
• Pre-gap size of 0.053 inches (1.30 mm) for optimal spark gap
• Thread diameter of 16.0 mm and reach of 0.750 inches (19.5 mm)
• Hex size 14 mm (9/16") for standard installation tools

About the Autolite Platinum Spark Plug Line

The Platinum Spark Plug line from Autolite focuses on combining platinum-tipped electrodes with fine wire copper cores to provide a balance of durability and efficient ignition. This design helps maintain consistent spark performance over time, reducing the need for frequent replacements. The HT15 model incorporates these features with a tapered seat and resistor type construction to support smooth engine operation in heavy-duty and performance vehicles.

Technical Details and Features

The HT15 spark plug features a platinum tip on the center electrode, which enhances wear resistance and extends service life compared to standard plugs. The copper core center electrode improves electrical conductivity, ensuring reliable ignition. The single tapered ground electrode made of nickel provides a stable spark path, while the extra-long ceramic insulator offers excellent heat dissipation and electrical insulation. The resistor type design with 5000 ohms resistance helps minimize radio frequency interference, protecting vehicle electronics.

Applications and Problem Solving

• Restores proper ignition in Ford F-150 and F-250 Super Duty engines
• Reduces misfires and rough idling in Lincoln Navigator and Ford Expedition
• Improves fuel efficiency and throttle response in Mustang and Mark LT
• Addresses spark plug wear and electrode erosion in high-mileage vehicles
• Helps maintain stable combustion under heavy load conditions

Installation Notes and Tips

Ensure the spark plug gap is set to the specified pre-gap size of 0.053 inches (1.30 mm) before installation. Use a 14 mm (9/16") socket wrench for proper tightening. The tapered seat design requires careful torque application to avoid damage to the cylinder head. Always install spark plugs when the engine is cool to prevent thread damage and ensure proper seating.

Quality Assurance and Warranty

Autolite Platinum Spark Plugs are manufactured to meet OEM specifications for fit, form, and function. The HT15 model undergoes rigorous quality control to ensure consistent performance. While specific warranty details are not provided, Autolite products typically come with manufacturer-backed quality assurance to support reliable operation in compatible Ford and Lincoln vehicles.