Autolite AP5405 Spark Plug

Autolite Platinum Spark Plug AP5405

Autolite Platinum Spark Plug AP5405 is an OE-style replacement spark plug built for consistent ignition performance in a wide range of Chrysler, Dodge, Plymouth, and Volkswagen applications. It uses platinum on the center electrode for added durability and a 0.050 in. pre-gap for direct-fit service on many late-model vehicles.

Key Features

• Platinum center electrode tip and core material for longer service life than standard copper designs
• 0.050 in. / 1.30 mm pre-gap for OE-style fitment
• Resistor spark plug with 4,000 ohm resistance
• Flat seat design with 14.0 mm thread diameter and 0.750 in. reach
• 5/8 in. hex size for standard spark plug service tools
• Ceramic extra-long insulator for stable ignition performance
• Nickel ground electrode with tapered tip design and single ground electrode

Product Details

The Autolite Platinum Spark Plug line is built as an OE-form, fit, and function replacement for everyday driving needs. AP5405 is engineered for vehicles that call for a platinum plug with a stud terminal, flat seat, and 0.050 in. gap. This part cross-references NGK 7781 for the same application. It is a direct replacement choice for drivers servicing Chrysler 300, Dodge Charger, and Dodge Nitro ignition systems, as well as other listed Chrysler, Dodge, Plymouth, and Volkswagen models.

Common Uses

• Hard starting caused by worn or fouled spark plugs
• Misfire symptoms related to weak ignition output
• Rough idle from degraded plug electrodes
• Reduced throttle response from aged secondary ignition components
• Fuel economy loss associated with worn spark plugs

Installation Notes

Verify the vehicle’s required plug specification before installation, including thread diameter, reach, seat type, terminal style, and gap. AP5405 is pre-gapped at 0.050 in., but final gap should always be checked against the vehicle service information. Use proper spark plug removal and installation procedures to avoid thread damage in the cylinder head. Fits 2005-2010 Chrysler 300, N/A; Fits 2006-2010 Dodge Charger, N/A; Fits 2007-2011 Dodge Nitro, N/A.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, with a focus on OE-style form and function across domestic and foreign applications. AP5405 is built to meet the dimensional and material requirements listed for the application, including platinum electrode construction and resistor design.