--- product_id: 148747082 title: "K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair" brand: "k-seal" price: "€ 89.03" currency: EUR in_stock: true reviews_count: 8 category: "K Seal" url: https://www.desertcart.it/products/148747082-k-seal-st5516-hd-multi-purpose-one-step-permanent-coolant store_origin: IT region: Italy --- # Saves up to 95% on costly repairs Effective for engine coolant leaks One-step permanent seal K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair **Brand:** k-seal **Price:** € 89.03 **Availability:** βœ… In Stock ## Summary > πŸš—πŸ’¨ Seal the leak, save the ride! ## Quick Answers - **What is this?** K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair by k-seal - **How much does it cost?** € 89.03 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/148747082-k-seal-st5516-hd-multi-purpose-one-step-permanent-coolant) ## Best For - k-seal enthusiasts ## Why This Product - Trusted k-seal brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Easy Application:** Simply add to your coolant system and drive - β€’ **Cost-Effective Solution:** Avoid expensive head gasket replacements and welding - β€’ **Permanent One-Step Seal:** Fixes coolant leaks without dismantling your engine - β€’ **Universal Compatibility:** Works with all types of coolants and engines - β€’ **Long-Lasting Performance:** Keeps your engine running cool for over 5000 KM ## Overview K-Seal ST5516 HD is a powerful, one-step coolant leak repair additive that permanently seals cracks and leaks in your vehicle’s cooling system. Lightweight and easy to use, it prevents engine overheating and saves you thousands in repair costs by eliminating the need for head gasket replacements or welding. Ideal for professional-grade maintenance and peace of mind on every drive. ## Description K-Seal HD Multi Purpose One Step Permanent Coolant Leak Repair Review: It really worked and saved a lot of money - There was a crack in head gasket of my car and coolant was leaking from there. Results in engine overheating. I added Kseal HD in in coolant and I had driven 5000 KM after that and crack is healed hence no overheating. Authorised service centre had asked to change the head gasket , that could have costed me around Rs. 75000. Local mechanic suggested to weld the crack. That too have costed around Rs. 20000. But Kseal costed me only Rs. 3500. And it really worked for me. Review: No use for coolant pump mild leaks - It s not sealing coolant pump mild leaks.. I can only seal radiator leaks, not in other places- saying by my own experience.. if coolant pump leaks, u better repair it instead of wasting on it.. ## Features - Item Weight 544 g - Product Dimensions 15 x 10.4 x 4.8 cm - Item Weight 544 gm ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | K-Seal | | Brand | K-Seal | | Product Dimensions | 14.99 x 10.41 x 4.83 cm; 540 g | | Item model number | ST5516HD | | Manufacturer Part Number | ST5516 | | Manufacturer | K-Seal | | Item Weight | 540 g | ## Images ![K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair - Image 1](https://m.media-amazon.com/images/I/71MW1pVoIUL.jpg) ![K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair - Image 2](https://m.media-amazon.com/images/I/711qxdv5xHL.jpg) ![K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair - Image 3](https://m.media-amazon.com/images/I/81Js2ztN+RL.jpg) ![K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair - Image 4](https://m.media-amazon.com/images/I/81367JDTP5L.jpg) ![K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair - Image 5](https://m.media-amazon.com/images/I/81sAcKFs57L.jpg) ## Questions & Answers **Q: Does it work on potentially warped heads** A: No idea **Q: how much do i need to pour in a diesel 1 ton cummins** A: You need this one bottle for a Dodge 3500 hd. I have this one bottle in my HD Freightliner 330hp MBZ engine hauling freight (54,000 lbs cap) 6 days a week and it stopped my coolant leak in the engine bay and heater core with no blockage and no. My opinion, Many reviews say products dont work BECAUSE most people dont take care of their equipment and their vehicles are old, high mileage and no maintenance done. None of the add to a tank products are as good as replacing with new parts but thats expensive, we get it. This may or may not fix your problem but its a low cost gamble with a high probability of success. Dont listen to the negative reviews. If the problem comes back, your damage was too far gone and in need of replacement anyway. **Q: Will this work with aluminum heads?** A: It works equally well with cast iron or aluminum. Great Stuff. Not a long-term solution, but it will buy you a lot of time. **Q: Tried using alumaseal, which isn't working. will i need to flush the system before using the k-seal?** A: I used the HD Truck bottle on my 1998 GEO Tracker ( used 1/3 of the bottle ) of K-Seal and it worked. I have used so many to no avail. To answer your question, I must have @ least 3 to 4 other sealers in my colling system when I added K-Seal. It's been almost a year & no adverse effects having not flushed my radiator. Should I have flushed the radiator & the system? Yes, I should have. ## Customer Reviews ### ⭐⭐⭐⭐⭐ It really worked and saved a lot of money *by A***R on 25 June 2018* There was a crack in head gasket of my car and coolant was leaking from there. Results in engine overheating. I added Kseal HD in in coolant and I had driven 5000 KM after that and crack is healed hence no overheating. Authorised service centre had asked to change the head gasket , that could have costed me around Rs. 75000. Local mechanic suggested to weld the crack. That too have costed around Rs. 20000. But Kseal costed me only Rs. 3500. And it really worked for me. ### ⭐ No use for coolant pump mild leaks *by M***N on 23 December 2019* It s not sealing coolant pump mild leaks.. I can only seal radiator leaks, not in other places- saying by my own experience.. if coolant pump leaks, u better repair it instead of wasting on it.. ### ⭐⭐ Only temporary fix *by H***I on 17 July 2022* It fixed the problem only for 2 months or 1000kms on drive,i use s300 2004 model ## Frequently Bought Together - K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required - PEAK 50/50 Prediluted Antifreeze and Coolant for All Engine Cooling Systems - K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.it/products/148747082-k-seal-st5516-hd-multi-purpose-one-step-permanent-coolant](https://www.desertcart.it/products/148747082-k-seal-st5516-hd-multi-purpose-one-step-permanent-coolant) --- *Product available on Desertcart Italy* *Store origin: IT* *Last updated: 2026-07-04*