--- product_id: 5394991 title: "Autolite Iridium XP Automotive Replacement Spark Plug, XP3924 (1 Pack)" brand: "autolite iridium ultra" price: "£12.59" currency: GBP in_stock: true reviews_count: 8 category: "Autolite Iridium Ultra" url: https://www.desertcart.co.uk/products/5394991-autolite-iridium-xp-automotive-replacement-spark-plug-xp3924-1-pack store_origin: GB region: United Kingdom --- # Platinum ground wire & V-trimmed electrode for optimal ignition 0.6mm finewire iridium tip for max fuel efficiency Up to 100,000 miles extended change interval Autolite Iridium XP Automotive Replacement Spark Plug, XP3924 (1 Pack) **Brand:** autolite iridium ultra **Price:** £12.59 **Availability:** ✅ In Stock ## Summary > ⚡ Ignite Performance, Drive Efficiency — Don’t Get Left Behind! ## Quick Answers - **What is this?** Autolite Iridium XP Automotive Replacement Spark Plug, XP3924 (1 Pack) by autolite iridium ultra - **How much does it cost?** £12.59 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/5394991-autolite-iridium-xp-automotive-replacement-spark-plug-xp3924-1-pack) ## Best For - autolite iridium ultra enthusiasts ## Why This Product - Trusted autolite iridium ultra brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted Legacy:** Backed by Autolite’s 80+ years of expertise and a limited lifetime warranty for peace of mind. - • **Precision Ignition:** 0.6mm finewire iridium tip delivers sharper, more consistent sparks for superior fuel economy. - • **Unmatched Longevity:** Engineered to last up to 100,000 miles, minimizing maintenance downtime. - • **Advanced Construction:** Platinum-protected ground wire and V-trimmed electrode optimize ignitability across ignition systems. - • **Universal Compatibility:** Designed to fit all makes and models, domestic and foreign—upgrade your ride effortlessly. ## Overview The Autolite Iridium XP XP3924 spark plug combines cutting-edge 0.6mm iridium finewire technology with platinum ground wire protection to deliver up to 100,000 miles of reliable, fuel-efficient ignition. Trusted since 1936, this universal-fit spark plug ensures optimal engine performance and durability backed by a limited lifetime warranty. ## Description Autolite Iridium XP is designed and engineered in the USA, is one of the brand's most technologically advanced spark plugs ever. These spark plugs provide better durability and a more focused ignition for better overall ignitability and optimum performance. Autolite Iridium XP spark plugs function for all makes and models, both foreign and domestic, provides the automotive aftermarket and original equipment manufacturers with the highest quality ignition products. Consider upgrading to Autolite iridium XP spark plugs for increased performance. Autolite Iridium XP spark plugs are backed by an unmatched limited lifetime warranty. Review: Great product - Excellent for. Performance of vehicle improved. Gap was preset and installed easily. Review: Autolite Iridium XP in a John Deere LA120 riding lawnmower - I replaced the 2 champion spark plugs in our John Deere LA120 riding lawnmower with 2 Autolite Iridium XP3924 spark plugs and it has never started quicker. It has over 200 hours on it and even when new it did not start so quickly. I have mowed our lawn twice (over 4.5 acres) since installing these Autolite Iridium spark plugs and I have not had to refill the gas tank. In the past I could get 1 and 3/4 mowings on a full tank of gas. Being Iridium spark plugs, these will not need to be replaced anywhere near as often as copper or platinum spark plugs. These Autolite Iridium spark plugs would be well worth the price just for the longer replacement intervals but factoring the quicker, smoother starts and lowered fuel consumption make these an even greater value! ## Features - EXTENDED CHANGE INTERVAL: The Autolite Iridium XP automotive replacement spark plug is engineered to last for up to 100,000 miles depending on engine type making it one of the most durable spark plugs on the market today - FUEL EFFICIENCY: These spark plugs utilize a 0.6mm finewire iridium centerwire tip design with laser welded technology for maximum fuel efficiency. Our finewire electrodes produce more focused and consistent ignitability resulting in less fuel consumption - OPTIMAL PERFORMANCE: This replacement iridium spark plug provides better durability and a more focused ignition for better overall ignitabilty and optimal performance - AUTOLITE ADVANTAGE: Autolite has been producing spark plugs since 1936 making it one of the most trusted and reliable brands for your OE replacement spark plug needs - CONSTRUCTION: Every iridium spark plug comes with a platinum protected ground wire for maximum efficiency in all ignition types including DIS systems and a V-trimmed ground electrode for improved ignitability ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000ET3XCY | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #170,686 in Automotive ( See Top 100 in Automotive ) #1,107 in Automotive Replacement Spark Plugs | | Brand | Autolite Iridium Ultra | | Brand Name | Autolite Iridium Ultra | | Compatible with Vehicle Type | Car, Truck | | Core Material | Iridium | | Customer Reviews | 4.4 out of 5 stars 167 Reviews | | Gap Size | 0.6 Millimeters | | Global Trade Identification Number | 00009100044365 | | Included Components | Iridium Spark Plug | | Item Type Name | Spark Plug | | Item Weight | 0.11 Pounds | | Manufacturer | FRAM | | Manufacturer Part Number | XP3924 | | Manufacturer Warranty Description | Lifetime Limited Warranty | | Model Number | XP3924 | | OEM Equivalent Part Number | XP3924 | | Thread Size | 12 mm | | Top Material Type | Nickel | | UPC | 009100044365 | | Unit Count | 1.0 Count | | Vehicle Service Type | Car, Truck | ## Product Details - **Brand:** Autolite Iridium Ultra - **Core Material:** Iridium - **Thread Size:** 12 mm - **Top Material Type:** Nickel - **Vehicle Service Type:** Car, Truck ## Images ![Autolite Iridium XP Automotive Replacement Spark Plug, XP3924 (1 Pack) - Image 1](https://m.media-amazon.com/images/I/61dYhg-5lEL.jpg) ![Autolite Iridium XP Automotive Replacement Spark Plug, XP3924 (1 Pack) - Image 2](https://m.media-amazon.com/images/I/71Bp1U-IOzL.jpg) ![Autolite Iridium XP Automotive Replacement Spark Plug, XP3924 (1 Pack) - Image 3](https://m.media-amazon.com/images/I/81a9JQsxxyL.jpg) ![Autolite Iridium XP Automotive Replacement Spark Plug, XP3924 (1 Pack) - Image 4](https://m.media-amazon.com/images/I/81X6OoVygxL.jpg) ![Autolite Iridium XP Automotive Replacement Spark Plug, XP3924 (1 Pack) - Image 5](https://m.media-amazon.com/images/I/71OdKPYQstL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product *by K***E on September 25, 2025* Excellent for. Performance of vehicle improved. Gap was preset and installed easily. ### ⭐⭐⭐⭐⭐ Autolite Iridium XP in a John Deere LA120 riding lawnmower *by D***N on June 8, 2024* I replaced the 2 champion spark plugs in our John Deere LA120 riding lawnmower with 2 Autolite Iridium XP3924 spark plugs and it has never started quicker. It has over 200 hours on it and even when new it did not start so quickly. I have mowed our lawn twice (over 4.5 acres) since installing these Autolite Iridium spark plugs and I have not had to refill the gas tank. In the past I could get 1 and 3/4 mowings on a full tank of gas. Being Iridium spark plugs, these will not need to be replaced anywhere near as often as copper or platinum spark plugs. These Autolite Iridium spark plugs would be well worth the price just for the longer replacement intervals but factoring the quicker, smoother starts and lowered fuel consumption make these an even greater value! ### ⭐⭐⭐⭐⭐ Perfect OEM Replacement *by W***S on June 17, 2025* No need for gapping these. They're already gapped form the factory. They fit right in my 2002 Chevrolet Prizm. Installation was a breeze and they seemed to be of good quality and function exactly how they're supposed to. ## Frequently Bought Together - Autolite Iridium XP Automotive Replacement Spark Plug, XP3924 (1 Pack) - HQPASFY Ignition Coil Pack 6pcs Compatible with Audi A4 A5 A6 Q5 Q7 R8 S4 S5 Volkswagen Touareg 3.0L 3.2L 4.2L 5.2L & More Replaces# 06E905115E, UF529, 06E905115F - LEXIVON 5/8" Swivel Magnetic Spark Plug Socket, 3/8" Drive x 10" Total Length | Enhanced Magnetic Design With Thin Wall Socket, Cr-v Steel (LX-122) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/5394991-autolite-iridium-xp-automotive-replacement-spark-plug-xp3924-1-pack](https://www.desertcart.co.uk/products/5394991-autolite-iridium-xp-automotive-replacement-spark-plug-xp3924-1-pack) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-03*