2025 Audi S4 Spark Plugs

The Iridium Power Spark Plug features the world’s smallest Iridium Center Electrode at just 0.4mm, delivering enhanced spark energy for maximum combustion efficiency. Engineered with a patented 360-degree laser welding assembly process, this spark plug ensures unmatched durability and precision. Its U-groove and taper-cut ground electrode design optimizes flame propagation, improving overall engine performance. Built to withstand extreme temperatures exceeding 4000 Deg F, it is burnished with nickel plating for exceptional high-temperature endurance and superior corrosion resistance. Designed for versatility, it offers a wide range of part numbers to fit thousands of applications, including classic and collector cars. With its flat seat type and premium iridium tip material, this spark plug guarantees long-lasting performance and reliability, making it an ideal choice for those seeking maximum spark energy and durability.

Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, the Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition for enhanced ignitability and performance. Features double Iridium-enhanced alloy technology center electrode for improved durability and wear resistance.

Engineered to meet the highest OE standards for performance, durability, and emissions, this Iridium Long-Life Spark Plug is a game-changer for your vehicle’s ignition system. Featuring DENSO’s patented Iridium Alloy with a 90% Iridium fine wire center electrode, it delivers unmatched spark efficiency and longevity. The platinum ground electrode ensures extended life, while the 360-degree laser welding process guarantees a robust bond and structural integrity. Designed to endure extreme temperatures exceeding 4,000 Deg F, this spark plug is built for high-performance ignition and specialized fuel systems. With a lifespan of over 100,000 miles, it lasts up to three times longer than conventional plugs, offering exceptional value and reduced maintenance. The flat seat type ensures a secure fit, making it a reliable choice for sustained spark performance and optimal engine efficiency.

The Double Platinum Spark Plug (PK20PR-P8) is engineered to meet the highest OE standards for performance, durability, and emissions compliance. Featuring OE-grade platinum on both the center and ground electrodes, it ensures superior thermal conductivity and sustained spark performance for over 60,000 miles. Its premium shell construction with machine-rolled threads enhances durability and provides a secure fit, while the flat seat type ensures optimal compatibility. Designed to reduce secondary required voltage, this spark plug increases ignition efficiency, delivering reliable performance and fewer shop comebacks. With its double platinum design, it offers exceptional longevity and consistent ignition, making it a trusted choice for maintaining your vehicle’s peak performance.

NGK V-Power spark plugs offer reliable performance and improved ignitability over standard nickel plugs. Engineered specifically for OE applications, the special V-cut nickel alloy center electrode and concave ground electrode of NGK’s V-Power spark plug increases ignitability providing quicker starts and smoother idle. NGK’s legendary high grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance. Trivalent metal plating ensures superior anti-corrosion and anti-seizing properties.

Autolite Copper spark plugs are designed to provide reliable performance and quick starts, making them an essential choice for maintaining your vehicle’s efficiency. Featuring a copper core center electrode, these spark plugs excel in thermal control and resist fouling, ensuring consistent operation. The high nickel alloy center and ground electrodes are engineered for extended life, while the high alumina multi-rib ceramic insulator enhances thermal conductivity and insulation strength. With a nickel-plated shell, these plugs resist corrosion, offering durability for long-term use. The mid-projection standard center electrode design, combined with nickel tip materials, ensures optimal spark delivery. Designed with a gasket seat type and equipped with a resistor, these spark plugs meet regular-grade specifications, making them a dependable option for a wide range of applications.

ACDelco Gold (Professional) Double Platinum Spark Plug are a high quality alternative to Original Equipment (OE) parts. With a copper core and double platinum pads on the center electrode, these plugs are designed to deliver long-lasting performance. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional.

ACDelco Gold (Professional) RAPIDFIRE Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These RAPIDFIRE Single Platinum Performance Spark Plugs are designed for everyday use and are a high quality replacement for many vehicles on the road today. These premium aftermarket spark plugs have high-quality suppressors that help prevent misfiring, an improved plug to boot seal, and a pure copper core for greater durability. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional.

BOSCH Double Platinum Spark Plugs are engineered to deliver both performance and long life, representing the best of OE spark plug technology. BOSCH utilizes a platinum firing pin on the center electrode and platinum inlay in the ground electrode. This design reduces gap erosion, increases durability and performance life while meeting Original Equipment specifications for double platinum spark plugs.

“The Premium DiamondFire Automotive Spark Plug is engineered to deliver peak performance and efficiency for your vehicle. Featuring E3’s patented Diamond Fire edge-to-edge ground electrode, it ensures a faster, more complete burn for smoother acceleration and idle. The innovative “”diamond-shaped”” side wire electrode enhances combustion by quickly igniting the air/fuel mixture, resulting in a larger and faster flame kernel. This translates to improved power output by up to 6% on average and significant fuel savings, while also reducing engine carbon deposits for a cleaner burn. Constructed with durable nickel for both the center and ground electrode tips, this spark plug is built to last. Its gasket seat type ensures a secure fit, and the pre-gapped design eliminates the need for adjustments, making installation hassle-free. Upgrade to this advanced spark plug for enhanced engine performance, better fuel efficiency, and a cleaner, more reliable ride.”

The Autolite Platinum spark plug is a high-performance solution designed to enhance your engine’s efficiency and longevity. Featuring a platinum center electrode firing tip, it ensures quicker firing, smoother starts, and improved fuel efficiency while resisting gap erosion for an extended service life. Its high alumina ceramic insulator provides excellent thermal conductivity and superior insulation, boosting overall strength and reliability. The multi-rib insulator design prevents flash-over, while the nickel-plated shell offers exceptional corrosion resistance, ensuring durability even in demanding conditions. With a mid-projection standard center electrode and a flat seat type, this spark plug is tailored for optimal performance in older engine designs. The combination of a platinum tip and nickel ground electrode makes it a dependable choice for those seeking enhanced acceleration and long-lasting performance. Whether you’re maintaining or upgrading, this performance-grade spark plug delivers exceptional value and reliability.

Autolite Iridium Ultra Laser Fine wire Spark Plugs are one of our brand’s most technologically advanced products. These spark plugs provide superior durability, more focused ignition with better overall ignitability for optimum performance. Autolite Spark Plugs are the best alternative to OE spark plugs, offering OE fit form and function supporting all foreign and domestic makes and models at a value price. Autolite provides the automotive aftermarket and original equipment manufacturers with the highest quality ignition products and is the leading supplier of spark plugs in the world.

ACDelco GM Original Equipment Conventional Spark Plugs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These Conventional Spark Plugs are designed for reliability and efficient performance, and are a high quality replacement for many vehicles on the road today. Their high-quality copper cores and outstanding suppression characteristics deliver reliable performance. They are also available for Marine applications. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.

Engineered to meet the highest OE performance, durability, and emissions standards, this Iridium Long-Life Spark Plug is a powerhouse of innovation and reliability. Featuring DENSO’s patented Iridium Alloy with a 90% Iridium fine wire center electrode, it delivers sustained spark performance for over 100,000 miles, lasting up to three times longer than conventional plugs. The platinum ground electrode ensures extended life, while the 360-degree laser welding process guarantees a superior bond and structural integrity. Designed to endure extreme temperatures exceeding 4,000 Deg F, it is ideal for high-performance ignition systems and special fuel setups. With a flat seat type and cutting-edge technology, this spark plug offers exceptional value, ensuring optimal engine performance and long-lasting durability.

NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode’s durability is six times harder than platinum. Iridium alloy’s extremely high melting point is perfect for today’s engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

The Racing Resistor Spark Plug is expertly crafted to deliver peak performance on the track, featuring a cut-back ground electrode for optimal ignitability and enhanced heat transfer, ensuring quicker starts and maximum engine efficiency. Its yttrium-enhanced alloy reduces ground wire temperature by up to 8%, making it ideal for colder heat ranges and performance modifications under intense conditions. The anti-corrosive nickel plating resists rust better than black oxide, maintaining durability and long-term reliability. Designed with a high alumina multi-rib ceramic insulator, it offers superior thermal conductivity and insulation, preventing flash-over while increasing strength. With a mid-projection center electrode and nickel-tipped materials for both the center and ground electrodes, this performance-grade spark plug is built to handle demanding environments. The flat seat design and integrated resistor further enhance its functionality, making it a dependable choice for racers seeking consistent ignition and durability.

The Racing Resistor Spark Plug is expertly crafted to deliver peak performance on the track, featuring a cut-back ground electrode for optimal ignitability and superior heat transfer, ensuring quicker starts and maximum engine efficiency. Its yttrium-enhanced alloy reduces ground wire temperature by up to 8%, making it ideal for colder heat ranges and performance modifications under intense conditions. The anti-corrosive nickel plating resists rust better than black oxide, maintaining durability and long-term efficiency. Designed with a high alumina multi-rib ceramic insulator, it offers exceptional thermal conductivity and insulation, preventing flash-over while enhancing strength. With a mid-projection center electrode and nickel-tipped components, this performance-grade spark plug is built to handle the demands of racing environments, delivering reliability and value for enthusiasts seeking top-tier engine performance.