Autolite APP64 Spark Plug

Autolite APP64 Double Platinum Spark Plug

Autolite APP64 is a Double Platinum spark plug built for OE-style fit, form, and function across a wide range of domestic and import applications. It uses platinum on both the center and ground electrodes for platinum-to-platinum firing, helping deliver consistent ignition performance in vehicles such as the Hyundai Sonata, Kia Optima, and Toyota Corolla.

The Autolite Double Platinum Spark Plug line focuses on easier starts, quicker throttle response, and improved fuel efficiency while matching original equipment dimensions and thread specifications. Part number APP64 is a practical replacement choice for drivers looking for a direct-fit ignition service part.

Key Features

• Double platinum center and ground electrode design for longer service life
• Pre-gapped to 0.044 in. / 1.10 mm for many listed applications
• 14.0 mm thread diameter with 0.750 in. reach and flat seat
• Resistor spark plug with 4,000 ohm resistance
• Ceramic insulator with mid-projection design
• Standard center electrode design with tapered ground electrode tip
• OE-style replacement for foreign and domestic vehicles

Product Details

Autolite APP64 is engineered as a direct replacement spark plug for a broad range of vehicles from 1961 through 2006. It is listed for many Hyundai, Kia, Mitsubishi, Toyota, Dodge, Chrysler, Volvo, BMW, Land Rover, and other applications, including 2001-2006 Hyundai Santa Fe, 1999-2005 Hyundai Sonata, and 2001-2004 Kia Optima. The platinum-to-platinum firing design supports stable spark delivery, while the resistor construction helps reduce electrical noise in the ignition system. This part cross-references CSF 3004 for the same application.

What It Helps Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Slower acceleration linked to degraded spark performance
• Reduced fuel economy from inefficient combustion
• Maintenance intervals shortened by standard copper plug wear

Installation Notes and Tips

Verify the vehicle-specific gap requirement before installation. The plug is pre-gapped at 0.044 in. / 1.10 mm, but some listed applications call for different settings such as 0.032 in., 0.035 in., or 0.028 in. Use the correct torque procedure for the cylinder head material, and confirm thread diameter, reach, seat type, and terminal style match the original plug. For fitment searches, this part is commonly referenced for 2001-2006 Hyundai Santa Fe, 1999-2005 Hyundai Sonata, and 2001-2004 Kia Optima applications.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and APP64 is built to OE form, fit, and function standards for the listed applications.