--- product_id: 50154348 title: "Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red" brand: "liqui moly" price: "6030 kr" currency: ISK in_stock: true reviews_count: 13 category: "Liqui Moly" url: https://www.desertcart.is/products/50154348-pro-line-radiator-stop-leak-k-250-ml-cooler-additive store_origin: IS region: Iceland --- # Works within 10 minutes Treats up to 40L coolant Seals small leaks fast Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red **Brand:** liqui moly **Price:** 6030 kr **Availability:** ✅ In Stock ## Summary > 🚗 Seal the deal before your coolant runs dry! ## Quick Answers - **What is this?** Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red by liqui moly - **How much does it cost?** 6030 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/50154348-pro-line-radiator-stop-leak-k-250-ml-cooler-additive) ## Best For - liqui moly enthusiasts ## Why This Product - Trusted liqui moly brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted by Thousands:** 4.5-star rating from nearly 3,000 users who swear by its reliability - • **Leak-Proof Confidence:** Stops hairline cracks & stone impact leaks without discolouring your coolant - • **Long-Lasting Protection:** Keeps your cooling system sealed for months, avoiding costly repairs - • **Universal Compatibility:** Perfect for passenger cars, commercial vehicles, and buses with water filters - • **Quick & Easy Application:** Just shake, pour at operating temp, and run engine for 10 minutes ## Overview Pro-Line Radiator Stop Leak K is a powerful 250 ml additive designed to quickly seal small leaks in vehicle cooling systems, treating up to 40 liters of coolant. Compatible with a wide range of vehicles, it works within 10 minutes without discolouring or blocking the coolant, backed by thousands of positive reviews and trusted by professionals. ## Description From the manufacturer Review: Works as it should - I've used this 3 times now and it's worked every time. Slowly losing coolant and this stopped it dead without discolouring the coolant and causing any blockages. Recommended. Review: It worked for me! - Used on Hyundai i40 1.7 cdti that had a very irritating slow leak from somewhere not obvious. I have no intention to plough money into this car.. it's a mobile tip! First time using anything like this as it goes against my inside engineer.... But to be fair, it's been a few months now since adding it and the coolant leak appears to be sealed! ## Features - Contains reaction mass of 5-chloro-2-methyl-2H-isothiazol-3-one and 2-methyl-2Hisothiazol-3-one (3:1). May produce an allergic reaction. - Safety data sheet available on request. - Small leaks caused by stone impacts, porous soldering points and hairline cracks in the cooling simple are easy to localize (one notices that the cooling water level is sinking). - Used for sealing small leaks in cooling circuits of passenger motor vehicles, commercial vehicles and buses. Also suited for cooling water circuits equipped with water filters. - Shake container before use. Start up the heater. With the engine running, pour the contents into the coolant at operating temperature and allow the engine to continue running for at least a further 10 minutes. - Contents will treat up to 40 liters of coolant. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004FPUUSS | | Best Sellers Rank | 6,780 in Automotive ( See Top 100 in Automotive ) 88 in Fillers, Adhesives & Sealants | | Brand | Liqui Moly | | Customer Reviews | 4.5 4.5 out of 5 stars (2,878) | | Date First Available | 28 Aug. 2012 | | Item Weight | 275 g | | Item model number | 5178 | | Manufacturer | Liqui Moly | | Manufacturer part number | 5178 | | Model | Pro-Line Radiator Sealer K | | Product Dimensions | 66.09 x 23.6 x 13.41 cm; 275 g | | Viscosity | 2T | ## Images ![Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red - Image 1](https://m.media-amazon.com/images/I/51AL1Pm7wmL.jpg) ![Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red - Image 2](https://m.media-amazon.com/images/I/6141COiHkAL.jpg) ![Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red - Image 3](https://m.media-amazon.com/images/I/61EBu-X5tgL.jpg) ![Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red - Image 4](https://m.media-amazon.com/images/I/716mnETyH-L.jpg) ![Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red - Image 5](https://m.media-amazon.com/images/I/7179+JqsfML.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works as it should *by A***6 on 13 May 2026* I've used this 3 times now and it's worked every time. Slowly losing coolant and this stopped it dead without discolouring the coolant and causing any blockages. Recommended. ### ⭐⭐⭐⭐⭐ It worked for me! *by N***X on 19 November 2025* Used on Hyundai i40 1.7 cdti that had a very irritating slow leak from somewhere not obvious. I have no intention to plough money into this car.. it's a mobile tip! First time using anything like this as it goes against my inside engineer.... But to be fair, it's been a few months now since adding it and the coolant leak appears to be sealed! ### ⭐⭐⭐⭐ Great for small discrepancies in your cooling system *by G***D on 21 April 2026* Worked for a while but ended up replacing thermostat. ## Frequently Bought Together - LIQUI MOLY Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178 - JOVS Jovs Antifreeze Coolant 5 Litre Long Life Red Ready Mixed Engine Coolant Ready to Use - Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml --- ## 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.is/products/50154348-pro-line-radiator-stop-leak-k-250-ml-cooler-additive](https://www.desertcart.is/products/50154348-pro-line-radiator-stop-leak-k-250-ml-cooler-additive) --- *Product available on Desertcart Iceland* *Store origin: IS* *Last updated: 2026-07-19*