Autolite Spark Plugs

Autolite Spark Plugs: A Legacy of Ignition Engineering

Autolite has been synonymous with spark plug performance since the brand produced its first plug in 1936. With roots stretching back to 1911 and spark plugs engineered across a century of refinement, Autolite brings a depth of ignition expertise that few brands can match. Autolite has been the official spark plug of NASCAR since April 2000 , a distinction that reflects real-world, high-stress validation far beyond the average commute.

A Spark Plug for Every Engine

Autolite offers a full coverage line of spark plugs for imports and domestic vehicles that includes iridium, double platinum, platinum, high-thread, and copper spark plugs for automotive applications, glow plugs for use in diesel engines, as well as small engine, high-performance, and powersports spark plugs. Whether you're maintaining a daily driver, building a performance vehicle, or keeping small outdoor equipment running strong, there's an Autolite plug designed for the task.

Key Autolite Spark Plug Product Lines

• Copper Resistor: The Autolite Copper Resistor spark plug line combines copper core electrodes with resistor technology to reduce radio frequency interference while maintaining strong ignition performance. These plugs are manufactured to meet or exceed OEM standards for ignition components.
• Iridium XP: Iridium XP spark plugs are engineered with an iridium-enhanced finewire and a proprietary, platinum ground electrode to increase durability, while the tapered ground wire maximizes engine efficiency. The result is improved ignitability, fuel efficiency, and acceleration.
• Iridium Ultra: Iridium Ultra is equipped with a laser-welded iridium-enhanced finewire center electrode that ensures the engine runs at maximum performance, while its double precious metal design provides increased durability, allowing the engine to maintain desired performance levels for longer.
• Racing Spark Plugs: Designed with a cut-back ground electrode, anti-corrosive nickel plating, and a large ground electrode for better heat transfer, Autolite racing spark plugs are engineered for all types of professional drivers looking to reach maximum performance on the track. The yttrium-enhanced alloy enables up to an 8% reduction in ground wire temperature for colder heat ranges designed to handle intense conditions.
• Small Engine / Lawn & Garden: Autolite small engine spark plugs are designed to meet the needs of mowers, tractors, chainsaws, snowblowers, leaf blowers, and more, ensuring that outdoor equipment continues to operate reliably all year long. A multi-rib ceramic insulator reduces the danger of flash-over, while a copper-glass seal bonds the center electrode and terminal post, providing a gas-tight internal seal.

Engineering That Goes Beyond the Basics

Built on a passion for engineering and producing high-quality spark plugs for nearly a century, Autolite spark plugs are designed to meet or exceed original equipment specifications for long life and lasting operation. Features like cold-formed steel shell precision rolled threads, long-projection ceramic insulators for heat dissipation, and resistor technology for noise suppression reflect an attention to detail that goes well beyond a simple fire-and-forget replacement part.

Whether you're doing a routine tune-up or chasing tenths on the track, explore the full Autolite brand page or browse all spark plugs to find the right plug for your application.