--- product_id: 42694642 title: "Autolite 25 Copper Resistor Automotive Replacement Spark Plugs (4 Pack)" brand: "autolite iridium ultra" price: "€ 2.78" currency: EUR in_stock: false reviews_count: 13 url: https://www.desertcart.pt/products/42694642-autolite-25-copper-resistor-automotive-replacement-spark-plugs-4-pack store_origin: PT region: Portugal --- # Boosts fuel efficiency & smooth acceleration Full copper core for max thermal conductivity Leak-proof copper-glass seal for durability Autolite 25 Copper Resistor Automotive Replacement Spark Plugs (4 Pack) **Brand:** autolite iridium ultra **Price:** € 2.78 **Availability:** ❌ Out of Stock ## Summary > ⚡ Ignite your drive with Autolite’s copper core spark plugs — where power meets precision! ## Quick Answers - **What is this?** Autolite 25 Copper Resistor Automotive Replacement Spark Plugs (4 Pack) by autolite iridium ultra - **How much does it cost?** € 2.78 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/42694642-autolite-25-copper-resistor-automotive-replacement-spark-plugs-4-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 - • **Built to Last:** Heat-fused internal seal and leak-proof copper-glass bonding guarantee long-lasting durability and reliability. - • **Trusted Legacy:** Backed by Autolite’s 80+ years of innovation, these plugs deliver proven performance and value for your ride. - • **Fuel-Savvy Ignition:** Optimized spark delivery promotes quicker starts, smoother acceleration, and improved fuel economy. - • **Precision Engineering:** Cold-formed steel shell with rolled threads and multi-rib insulator reduces misfires and radio interference. - • **Unmatched Thermal Power:** Full copper core electrode ensures superior heat transfer for peak engine performance in any condition. ## Overview Autolite 25 Copper Resistor Spark Plugs feature a full copper core electrode for enhanced thermal conductivity, a leak-proof copper-glass seal for durability, and a resistor to reduce radio frequency interference. Designed for quick starts, better fuel economy, and smooth acceleration, these plugs are engineered with precision rolled threads and a multi-rib insulator to prevent misfires. Trusted since 1936, Autolite delivers reliable, high-performance spark plugs ideal for motorcycles and older vehicles seeking efficient ignition and lasting value. ## Description Autolite Copper Core Spark Plugs deliver quick starts, good fuel economy, and smooth acceleration. The copper-glass seal bonds insulator and terminal post center electrode together to ensure full required voltage at spark gap, creating a gas-tight seal that is 100 percent leak-proof. Copper Core spark plugs feature a cold-formed steel shell and precision rolled threads, and a one-piece terminal post that adds strength. The multi-rib insulator reduces the danger of "flash-over" to prevent misfires, and the resistor reduces radio frequency interference (RFI) and electrode erosion. The full copper core electrode provides better performance in all conditions. Autolite Copper Core plugs are your industry standard. Review: works - good Review: Great for an older vehicle - These fit great for my 95 f150 with a 302. My old girl gets better milage and power with these copper plugs vs. iridium or more expensive plugs ## Features - MAXIMUM PERFORMANCE: Every Copper Spark Plug has a full copper core electrode which provides higher thermal conductivity for better performance in all conditions - IMPROVED DURABILITY: All Autolite spark plugs are Leak proof and come with a heat fused internal seal for long lasting durability - CONSTRUCTION: These replacement spark plugs have a copper-glass seal which bonds the insulator and the terminal post center electrode together - FUEL EFFICIENCY: The Autolite copper automotive replacement spark plug are guaranteed to deliver quick starts, better fuel economy and smooth acceleration - AUTOLITE ADVANTAGE: Since 1936, Autolite has been a trusted leader and innovator in spark plug technology. You can count on our copper plugs for performance and value, backed by decades of experience and passion ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000CBQ5QA | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #899,032 in Automotive ( See Top 100 in Automotive ) #4,530 in Automotive Replacement Spark Plugs | | Brand | Autolite Iridium Ultra | | Brand Name | Autolite Iridium Ultra | | Compatible with Vehicle Type | Motorcycle | | Core Material | Copper | | Customer Reviews | 4.6 out of 5 stars 434 Reviews | | Global Trade Identification Number | 00009100003690 | | Included Components | 4 spark plugs | | Item Type Name | Copper Resistor Spark Plug | | Item Weight | 1.76 ounces | | Manufacturer | FRAM | | Manufacturer Part Number | 25-4PK | | Manufacturer Warranty Description | Lifetime Limited Warranty | | Model Number | 25-4PK | | Number of Items | 4 | | OEM Equivalent Part Number | 25-4PK | | Thread Size | RM | | Top Material Type | Alloy Steel | | UPC | 009100003690 | | Unit Count | 1 Count | | Vehicle Service Type | Motorcycle | ## Product Details - **Brand:** Autolite Iridium Ultra - **Core Material:** Copper - **Thread Size:** RM - **Top Material Type:** Alloy Steel - **Vehicle Service Type:** Motorcycle ## Images ![Autolite 25 Copper Resistor Automotive Replacement Spark Plugs (4 Pack) - Image 1](https://m.media-amazon.com/images/I/71-GAahSRNL.jpg) ![Autolite 25 Copper Resistor Automotive Replacement Spark Plugs (4 Pack) - Image 2](https://m.media-amazon.com/images/I/51RL8QgO9vL.jpg) ![Autolite 25 Copper Resistor Automotive Replacement Spark Plugs (4 Pack) - Image 3](https://m.media-amazon.com/images/I/71sRR+tS62L.jpg) ![Autolite 25 Copper Resistor Automotive Replacement Spark Plugs (4 Pack) - Image 4](https://m.media-amazon.com/images/I/71MGX4XYJQL.jpg) ![Autolite 25 Copper Resistor Automotive Replacement Spark Plugs (4 Pack) - Image 5](https://m.media-amazon.com/images/I/71OdKPYQstL.jpg) ## Questions & Answers **Q: Is there only 1 per package?** A: this is one spark plug for .99 plus shipping charges. **Q: how many are in the package?** A: One per package **Q: can these be used in a 2009 twin cam harley?** A: No I do not show Autolite 25 to be listed for any Harley Davidson. **Q: Will this work in lawn mower briggs & stratton engine?** A: I purchased see these for a Ford 302 V8. While plugs go into a variety of engines Im not so sure about a mower. If you no longer have the manual for your engine I would take some photos of any markings on it and go to a mower shop. Any decent place should be able to look it up from the serial number. Better yet, remove the old plug and use the same one. ## Customer Reviews ### ⭐⭐⭐⭐⭐ works *by T***M on April 21, 2026* good ### ⭐⭐⭐⭐⭐ Great for an older vehicle *by T***L on January 11, 2026* These fit great for my 95 f150 with a 302. My old girl gets better milage and power with these copper plugs vs. iridium or more expensive plugs ### ⭐⭐⭐⭐⭐ would buy again *by A***R on June 11, 2025* very pleased boxes where not all beat up. plugs in good shape. meaning brand new ... unlike some other vendors I bought from in the past thus I sent them back and got refunded I will buy from this vendor again ## Frequently Bought Together - Autolite 25 Copper Resistor Automotive Replacement Spark Plugs (4 Pack) - Motorcraft DH411B Distributor Cap,Grey - Motorcraft DR374B Rotor, Large --- ## 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.pt/products/42694642-autolite-25-copper-resistor-automotive-replacement-spark-plugs-4-pack](https://www.desertcart.pt/products/42694642-autolite-25-copper-resistor-automotive-replacement-spark-plugs-4-pack) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-10-04*