Autolite AP45 Spark Plug

Autolite Platinum Spark Plug AP45 Overview

The Autolite Platinum Spark Plug AP45 is built for dependable ignition performance in a wide range of Ford, Mercury, and Lincoln applications. With platinum center electrode materials, a nickel ground electrode, and a resistor design, it supports easier starts, quicker acceleration, and improved fuel economy compared with standard copper plugs.

Compatible With classic Ford truck and van applications, this Autolite Platinum Spark Plug AP45 is a direct-fit OE-style replacement for many 1958-1987 Ford, Mercury, and Lincoln engines. It is a practical choice for drivers searching for a Ford F-150 spark plug, Ford Bronco spark plug, or Mercury Cougar ignition tune-up part.

Key Features

• Platinum center electrode core and tip material for added durability
• Nickel ground electrode core and tip with tapered design
• Resistor type plug with 4000 resistance
• Pre-gapped at 0.044 in. / 1.10 mm
• 18 mm thread diameter, 13/16 in. hex size, tapered seat
• Ceramic insulator with mid projection design
• OE form, fit, and function for many domestic applications

Product Line Details

Autolite Platinum Spark Plugs are positioned as a durable upgrade over standard copper plugs. The platinum construction helps maintain consistent ignition performance over time, while the OE-style dimensions make the AP45 a straightforward replacement for many older Ford, Mercury, and Lincoln vehicles.

Detailed Description

The AP45 spark plug is engineered for ignition systems that call for an 18 mm tapered-seat plug with a 0.044 inch gap. Its platinum center electrode helps resist wear, while the nickel ground electrode supports stable spark delivery. For owners maintaining a Ford F-250, Ford E-350 Econoline, or Mercury Marquis, this plug offers a service part that matches the original fitment requirements listed for those vehicles.

This part cross-references Champion Spark Plug 22 for the same application.

What It Helps Address

• Hard starting caused by worn spark plugs
• Rough idle from weak or inconsistent spark
• Reduced throttle response during acceleration
• Fuel economy loss related to ignition wear
• Maintenance replacement for aging OE-style plugs

Installation Notes and Tips

• Verify the vehicle’s required gap before installation; many listed applications call for 0.044 in. / 1.1 mm, while some older models use different settings.
• Confirm thread diameter, reach, and seat type match the engine specification before threading in the plug.
• Use the correct torque procedure for the cylinder head material to avoid damage.
• Check ignition wires, cap, and rotor condition during tune-up service.
• For fitment-specific searches, this AP45 is listed for applications such as Fits 1980-1986 Ford F-150, N/A and Fits 1965-1974 Ford Mustang, N/A.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment channels, with a focus on OE-style fit and consistent manufacturing standards. The AP45 is built to meet the dimensional and performance requirements shown in the fitment data for Ford, Mercury, and Lincoln vehicles.