Autolite XP5684 Spark Plug

Autolite Iridium XP Spark Plug XP5684

Autolite XP5684 is an iridium spark plug built for modern Toyota, Lexus, Nissan, and Mitsubishi engines that call for a fine-wire OE-style design. It uses an iridium center electrode, a platinum ground tip, and a tapered ground electrode to support efficient combustion, steady ignition, and durable service in demanding daily driving.

Key Features

• Iridium-enhanced fine-wire center electrode for consistent spark delivery
• Platinum ground electrode tip for added durability
• Taper-cut ground electrode design to improve ignitability and engine efficiency
• Pre-gapped at 0.044 in. / 1.1 mm
• Resistor plug with 4,000 ohms resistance
• Ceramic insulator with copper core center electrode
• M12 x 1.25 thread size, 1.043 in. reach, flat seat
• Performance-grade ignition component for secondary ignition service

Product Details

The Autolite Iridium Spark Plug line is engineered for drivers who want OE-style fit and modern ignition performance in one part. XP5684 combines an iridium center electrode with a platinum ground electrode and a fine-wire design to help maintain a stable spark under heat and load. The tapered ground wire supports efficient flame initiation, which is important for vehicles such as the Toyota Camry, Toyota Corolla, Toyota RAV4, Lexus ES300h, and Nissan Sentra that rely on precise ignition control for smooth operation.

This part cross-references Anchor 3439 for the same application. Autolite XP5684 is also listed for a wide range of late-model Toyota, Lexus, Nissan, and Mitsubishi applications, including Toyota Prius, Toyota Sienna, Lexus NX350h, Nissan Altima, and Mitsubishi Outlander.

What It Helps Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark output
• Reduced fuel economy related to ignition wear
• Slower throttle response during acceleration
• Misfire concerns tied to aged secondary ignition components

Installation Notes and Tips

Verify thread size, reach, seat type, and pre-gap before installation. XP5684 uses a flat seat, M12 x 1.25 thread, and a 0.044 in. pre-gap, so it should be matched to the vehicle’s ignition specification before service. Use proper spark plug socket tools and torque to the vehicle manufacturer’s specification. Check coil boots and ignition coils during plug replacement to avoid repeat misfire issues.

Quality Assurance

Autolite designs the Iridium XP line with an iridium fine-wire center electrode and a platinum ground tip to improve durability and maintain ignition performance over time. XP5684 is built as a performance-grade spark plug for OE-style service intervals and consistent operation in compatible Toyota, Lexus, Nissan, and Mitsubishi applications.