--- product_id: 345556227 title: "Bosch 9603 OE Fine Wire Double Iridium Spark Plug - Pack of 4" brand: "bosch" price: "£35.37" currency: GBP in_stock: true reviews_count: 5 category: "Bosch" url: https://www.desertcart.co.uk/products/345556227-bosch-9603-oe-fine-wire-double-iridium-spark-plug-pack store_origin: GB region: United Kingdom --- # 4X longer service life vs copper plugs 0.6mm ultra-fine wire for superior ignitability 360° laser weld for unmatched durability Bosch 9603 OE Fine Wire Double Iridium Spark Plug - Pack of 4 **Brand:** bosch **Price:** £35.37 **Availability:** ✅ In Stock ## Summary > ⚡ Ignite your engine’s potential with Bosch’s double iridium spark plugs—where precision meets longevity. ## Quick Answers - **What is this?** Bosch 9603 OE Fine Wire Double Iridium Spark Plug - Pack of 4 by bosch - **How much does it cost?** £35.37 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/345556227-bosch-9603-oe-fine-wire-double-iridium-spark-plug-pack) ## Best For - bosch enthusiasts ## Why This Product - Trusted bosch brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Withstand:** 360-degree continuous laser weld fuses corrosion-resistant iridium for rock-solid durability. - • **Plug & Play Perfection:** Factory pre-gapped and nickel-plated threads mean effortless installation—no anti-seize needed. - • **Endurance That Outlasts:** Double iridium electrodes deliver up to 4X longer lifespan, keeping your ride smooth for years. - • **Precision Ignition Mastery:** Ultra-fine 0.6mm iridium wire ensures lightning-fast spark and peak engine performance. - • **Engineered for Modern Power:** OE-matched spark position optimized for Gasoline Direct Injection (GDI) engines, future-proofing your drive. ## Overview Bosch 9603 OE Fine Wire Double Iridium Spark Plugs feature ultra-fine 0.6mm iridium electrodes and a 360° laser weld for superior ignitability, durability, and up to 4X longer service life compared to standard copper plugs. Pre-gapped and nickel-plated for easy installation, these plugs are engineered for modern GDI engines, delivering smoother performance and improved fuel efficiency. ## Description Bosch 9603/FR7KII33X Double Iridium Spark Plugs are engineered to deliver both high performance and long life, representing advanced original equipment (OE) spark plug technology. The ultra-fine wire design and laser welded tapered ground electrode deliver optimum performance, while the Iridium center electrode and ground electrode help it to go the distance. OE-matched spark position ensures compatibility with Gasoline Direct Injection (GDI) technology used in modern gas engines. Bosch Double Iridium Spark Plugs are pre-gapped at the factory and feature nickel plated rolled threads that require no anti-seize, for simple, easy installation right out of the box. Unlock the performance in your engine with Bosch Double Iridium Spark Plugs. Review: 2012 2.5 Toyota engine running smooth, exceeding freeway mileage rating in mixed driving, 80000 miles with Carfax reported plug change at 50000 - what difference will replacement spark plugs make? Give it try. $30 and a half hour of work. Old ones were factory spec and visibly but not terribly crusty/worn, so maybe Carfax was wrong about the early replacement by the former owner; still, oem are rated for 100k-120k. Result? Perceptibly smoother engine; 100 lower idle RPM; 1.5 mpg improvement. So yeah, significant improvement. Moral: a good DIY project but if I had been faced with a $300 shop estimate…. Observation: those casual mechanics hanging looking to install basic parts around car parts shops probably do more to keep 7-year + vehicles on the road than dealerships who think in terms of $300-$500-$700 price points. Review: Works well as it is supposed to do.. ## Features - Double Iridium firing pin and ground electrode inlay provide 4X longer service life compared to standard copper plugs - 0.6mm fine wire firing pin provides superior ignitability and performance - 360 Degree continuous laser weld fuses corrosion resistant iridium firing pin to base for increased durability - 7 year performance satisfaction - International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0792LVCZW | | Automotive Fit Type | Universal Fit | | Best Sellers Rank | 99,369 in Automotive ( See Top 100 in Automotive ) 558 in Car Spark Plugs | | Brand Name | Bosch | | Compatible with Vehicle Type | Car, SUV, Truck | | Core Material | Iridium | | Customer Reviews | 4.6 4.6 out of 5 stars (644) | | Gap Size | 0.6 Millimeters | | Global Trade Identification Number | 00028851010382 | | Item Type Name | Up to 4X Longer Life (4 Pk) Acura; Chrysler; Ford; Honda; Infiniti; Jaguar; Lexus; Mercedes-Benz; Mitsubishi; Nissan; Subaru; Toyota +More | | Item Weight | 197 g | | Manufacturer | Bosch | | Manufacturer Part Number | 9603 | | Model Number | 9603 | | Thread Size | M30 | | Top Material Type | Nickel | | UPC | 028851010382 | | Unit Count | 4.0 count | ## Product Details - **Brand:** Bosch - **Core material:** Iridium - **Thread size:** M30 - **Top material type:** Nickel - **Vehicle service type:** Car, SUV, Truck ## Images ![Bosch 9603 OE Fine Wire Double Iridium Spark Plug - Pack of 4 - Image 1](https://m.media-amazon.com/images/I/71FZXJroy2L.jpg) ![Bosch 9603 OE Fine Wire Double Iridium Spark Plug - Pack of 4 - Image 2](https://m.media-amazon.com/images/I/61GmL0w8STL.jpg) ![Bosch 9603 OE Fine Wire Double Iridium Spark Plug - Pack of 4 - Image 3](https://m.media-amazon.com/images/I/61SR5jxEiPL.jpg) ![Bosch 9603 OE Fine Wire Double Iridium Spark Plug - Pack of 4 - Image 4](https://m.media-amazon.com/images/I/51Q9udIwTTL.jpg) ![Bosch 9603 OE Fine Wire Double Iridium Spark Plug - Pack of 4 - Image 5](https://m.media-amazon.com/images/I/61xQszqJFIL.jpg) ## Available Options This product comes in different **Color, Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by M***K on 1 February 2026* 2012 2.5 Toyota engine running smooth, exceeding freeway mileage rating in mixed driving, 80000 miles with Carfax reported plug change at 50000 - what difference will replacement spark plugs make? Give it try. $30 and a half hour of work. Old ones were factory spec and visibly but not terribly crusty/worn, so maybe Carfax was wrong about the early replacement by the former owner; still, oem are rated for 100k-120k. Result? Perceptibly smoother engine; 100 lower idle RPM; 1.5 mpg improvement. So yeah, significant improvement. Moral: a good DIY project but if I had been faced with a $300 shop estimate…. Observation: those casual mechanics hanging looking to install basic parts around car parts shops probably do more to keep 7-year + vehicles on the road than dealerships who think in terms of $300-$500-$700 price points. ### ⭐⭐⭐⭐⭐ Review *by A***N on 23 October 2024* Works well as it is supposed to do.. ### ⭐⭐⭐⭐⭐ Review *by M***N on 10 November 2023* تاكد انه مخصص لسيارتك ## Frequently Bought Together - BOSCH 9603 OE Fine Wire Double Iridium Spark Plug - Pack of 4 - FEL-PRO VS 50530 R Engine Valve Cover Gasket Set for Toyota Camry --- ## 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/345556227-bosch-9603-oe-fine-wire-double-iridium-spark-plug-pack](https://www.desertcart.co.uk/products/345556227-bosch-9603-oe-fine-wire-double-iridium-spark-plug-pack) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-01*