--- product_id: 13219571 title: "High Mileage 4 6 8 Compression Repair" brand: "bar's leaks" price: "£22.31" currency: GBP in_stock: true reviews_count: 13 category: "Bar's Leaks" url: https://www.desertcart.co.uk/products/13219571-high-mileage-4-6-8-compression-repair store_origin: GB region: United Kingdom --- # Stabilizes engine compression 16.9 oz concentrated formula Made in the USA quality High Mileage 4 6 8 Compression Repair **Brand:** bar's leaks **Price:** £22.31 **Availability:** ✅ In Stock ## Summary > ⚡ Don’t Replace—Restore! Power up your high-mileage engine with Rislone. ## Quick Answers - **What is this?** High Mileage 4 6 8 Compression Repair by bar's leaks - **How much does it cost?** £22.31 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/13219571-high-mileage-4-6-8-compression-repair) ## Best For - bar's leaks enthusiasts ## Why This Product - Trusted bar's leaks brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Eco-Friendly Performance:** No harmful metals—helps pass emissions tests while protecting your engine. - • **Precision Polymer Technology:** Fills cylinder scratches & grooves to restore lost power and reduce blow-by. - • **Trusted by High-Mileage Pros:** Join thousands who’ve saved their engines from costly replacements. - • **Universal Engine Compatibility:** Works seamlessly with gasoline & diesel engines, including high mileage and synthetics. - • **Revive Your Engine’s Heartbeat:** Boost and stabilize compression for smoother, more powerful rides. ## Overview Rislone 4447 High Mileage Compression Repair is a 16.9 oz concentrated additive made in the USA, designed to restore and stabilize engine compression in worn gasoline and diesel engines. Its proprietary blend of high-shear polymers fills cylinder wall imperfections, reduces blow-by, and improves power and fuel efficiency without harmful metals, making it a trusted solution for extending engine life and passing emissions tests. ## Description Rislone High Mileage Compression Repair with Ring Seal is a concentrated proprietary blend of high-shear and premium polymers developed for higher mileage engines that are suffering from decreased or uneven compression. Low compression can be caused by normal engine wear and decreased sealing between the piston rings and cylinder walls. The non-dispersant olefin copolymers fill scratches & grooves in cylinder walls to increase and stabilize compression in all cylinders. Compression Repair renews worn engines, rebuilds compression, restores lost power and repairs engine blow-by. In addition, Compression Repair helps vehicles pass emission tests. Some signs of decreased compression include loss of power, poor fuel mileage, oil consumption, blue smoke from exhaust, plug fouling and engine noise or vibration. The Viscosity Improver (VI) is designed specifically to provide an optimum balance of shear stability and thickening efficiency required in old and modern engines. This performance additive meets the most severe passenger car and truck engine requirements. Product works by freeing sticky rings and filling gaps & scratches in cylinder walls, eliminating blow-by and compression loss while also reducing friction and wear. Blow-by is usually caused by gaps in internal engine parts resulting from excess wear. Rislone Compression Repair with Ring Seal does not contain any harmful lead or other metals that could damage the inside of your engine or be burned and contaminate emissions components and the environment. Works on gasoline and diesel engines with conventional, high mileage and synthetic engine oils. Review: Try it out before going to second plan - I started noticing some rough idle and blowby so I change the plugs and wires and still had some issues. Took it to a shop and they did a compression test and found cylinder 5 was at half the pressure. They recommend an engine replacement. I searched and found this additive Rislone. I skeptically added just half the bottle at first. The engine sounded more silent and less rough than before. I then added the 2nd half now knowing it wouldn’t hurt the engine. So far I’ve driven about 500 miles. I noticed the car sounds and feels a lot better. I don’t have any blowby and gas mpg looks about right. It’s possible the solution freed up some gunk on the pistons rings or idk but I think it works. I would recommend you try it before condemning an engine and getting a new one. The solution is think like honey so it kinda worried me at first but it turned out fine. It probably cleaned up all the engine parts. Review: UNBELIEVABLE- It really works. Restored a 34 year old engine. - I have a 1989 boat. The engine is the Mercruiser 4-cylinder Alpha One. The engines were actually made by General Motors. They were used in Chevys, and they adapted them for marine use by putting their own intake manifolds and exhaust manifolds on them. I would note that marine engines have a hard life. They are frequently run wide open at 4,000 RPMs for long periods of time, causing more wear than the same engine in a car would experience. So, my engine was 34 years old and very tired. Starting was unreliable. It would crank and crank until it would catch, and then I had to keep the rpms at about 3,000 for a while or it would die. You could tell one cylinder was not firing- maybe two because of the lumpy running and engine shaking. Idling was out of the question for at least 5 minutes. If other people were at the boat ramp I felt embarrassed because of all the blue smoke my boat made. I decided to add one container of this product to my oil to see what would happen. The first four times I started the engine, there was no change. About the fifth time, I noticed it was running more smoothly. Then, after about a month, I accidentally started the engine without giving it any throttle- I just turned the key. It started right away (miracle #1) AND idled smoothly at 700RPM (miracle #2). I could not believe it! I turned it off and started it again, and the same thing happened. Since then, it has done this every time. No blue smoke, no engine shaking, engine starts immediately and idles smoothly. That's my story. I don't know what they put into this product, but whatever it is it actually works. It restored my balky, high-mileage engine so it now starts and purrs like a baby. I would highly recommend this product, and that's an understatement. ## Features - INCREASE AND STABILIZE COMPRESSION: Rislone High Mileage Compression Repair with Ring Seal is a concentrated proprietary blend of high-shear and premium polymers developed for higher mileage engines that are suffering from decreased or uneven compression. - RENEWS WORN ENGINES: Low compression can be caused by normal engine wear and decreased sealing between the piston rings and cylinder walls. - RESTORES LOST POWER: The non-dispersant olefin copolymers fill scratches & grooves in cylinder walls to increase and stabilize compression in all cylinders. - REPAIRS ENGINE BLOW-BY: Compression Repair renews worn engines, rebuilds compression, restores lost power and repairs engine blow-by. In addition, Compression Repair helps vehicles pass emission tests. - MADE IN THE USA: Use on any gasoline or diesel engine ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00CGRX6RE | | Automotive Fit Type | Universal Fit | | Best Sellers Rank | #10,805 in Automotive ( See Top 100 in Automotive ) #24 in Engine & Oil Fluid Additives | | Brand | Bar's Leaks | | Brand Name | Bar's Leaks | | Compatible with Vehicle Type | Car, Truck, Motorcycle, ATV, etc. | | Container Type | Bottle | | Customer Reviews | 4.4 out of 5 stars 2,026 Reviews | | Global Trade Identification Number | 00078615044474 | | Included Components | Item | | Item Weight | 5.6 ounces | | Liquid Volume | 16.5 fluid ounces | | Manufacturer | Rislone | | Manufacturer Part Number | 4447 | | Manufacturer Warranty Description | No | | Model Number | 4447 | | Number of Packs | 1 | | Package Information | Bottle | | Size | Pack of 1 | | UPC | 078615044474 078615444472 | | Unit Count | 16.9 Fluid Ounces | | Vehicle Service Type | Car, Truck, Motorcycle, ATV, etc. | ## Product Details - **Brand:** Bar's Leaks - **Liquid Volume:** 16.5 Fluid Ounces - **Package Information:** Bottle - **UPC:** 078615044474 078615444472 - **Vehicle Service Type:** Car, Truck, Motorcycle, ATV, etc. ## Images ![High Mileage 4 6 8 Compression Repair - Image 1](https://m.media-amazon.com/images/I/61we3oHoC9L.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Can you use this product and the anti-friction product at the same time?** A: Hello, and thank you for your question. We appreciate you considering Rislone for your automotive needs. Since you don't specify which anti-friction product you are asking about, it's difficult for us to give you a complete answer. What we can say is this: Rislone High Mileage Compression Repair (part number 4447) IS compatible with Rislone Nano Prime Engine & Oil Additive (part number 4104), which uses Nano Tungsten and Moly to reduce friction up to 38%. We have not tested the Compression Repair with products from other manufacturers, so we are not able to address possible compatibility concerns in that area. We hope this satisfactorily answers your question. If you have any other questions or would like additional information on these or any of our products, please feel free to call our Tech Support Team at 1-800-345-6572. We are here to assist you Monday through Friday, from 8 am to 5 pm Eastern time. **Q: Can i use (mix) this product if i am using xl nanolube engine oil additive & nano treatment; reduces oil burning & engine smoke** A: Thank you for your question and for considering Rislone Compression Repair with Ring Seal (part number 4447) to help with your automotive needs. We cannot recommend these two products be mixed as we only have test data on compatibility within our own family of products. Since we don't test the efficacy or compatibility of our products alongside a competitors product, we can't advise you to use them together. We certainly appreciate your interest, but as a family run company for over 70 years, we pride ourselves on being honest with our customers - if we don't think we can help you, we will let you know, and in this case, we can't. If you have any other questions or we may provide additional information, please feel free to contact our Tech Support team at 1-800-345-6572. We are here to assist you Monday through Friday, from 8 am to 5 pm Eastern time. **Q: Do i put in every oil chang or is it a 1 time and done** A: Every oil change. I have an 87 Toyota Corolla with 200k, it takes 3 at this point. I have observed that it works after the first trip. It has eliminated blue smoke and low oil pressure. "Your mileage may vary". **Q: Is it safe to use in engines with variable valve timing? Like a 1997 Honda Prelude** A: Thank you for your question, and for considering Rislone to help with your Honda. When installed following instructions, Rislone Compression Repair with Ring Seal (part number 4447) is safe to use in your Prelude. It can be used in all 4, 5, 6, 8, and 10 cylinder gasoline or diesel engines, and can be used with conventional, high mileage, and synthetic engine oils. Do not overfill. If you have any other questions, or would like any additional information, please feel free to call our Tech Support team at 1-800-345-6572. We are here to assist you Monday through Friday, from 8 am to 5 pm, Eastern time. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Try it out before going to second plan *by D***N on June 2, 2026* I started noticing some rough idle and blowby so I change the plugs and wires and still had some issues. Took it to a shop and they did a compression test and found cylinder 5 was at half the pressure. They recommend an engine replacement. I searched and found this additive Rislone. I skeptically added just half the bottle at first. The engine sounded more silent and less rough than before. I then added the 2nd half now knowing it wouldn’t hurt the engine. So far I’ve driven about 500 miles. I noticed the car sounds and feels a lot better. I don’t have any blowby and gas mpg looks about right. It’s possible the solution freed up some gunk on the pistons rings or idk but I think it works. I would recommend you try it before condemning an engine and getting a new one. The solution is think like honey so it kinda worried me at first but it turned out fine. It probably cleaned up all the engine parts. ### ⭐⭐⭐⭐⭐ UNBELIEVABLE- It really works. Restored a 34 year old engine. *by A***R on July 6, 2025* I have a 1989 boat. The engine is the Mercruiser 4-cylinder Alpha One. The engines were actually made by General Motors. They were used in Chevys, and they adapted them for marine use by putting their own intake manifolds and exhaust manifolds on them. I would note that marine engines have a hard life. They are frequently run wide open at 4,000 RPMs for long periods of time, causing more wear than the same engine in a car would experience. So, my engine was 34 years old and very tired. Starting was unreliable. It would crank and crank until it would catch, and then I had to keep the rpms at about 3,000 for a while or it would die. You could tell one cylinder was not firing- maybe two because of the lumpy running and engine shaking. Idling was out of the question for at least 5 minutes. If other people were at the boat ramp I felt embarrassed because of all the blue smoke my boat made. I decided to add one container of this product to my oil to see what would happen. The first four times I started the engine, there was no change. About the fifth time, I noticed it was running more smoothly. Then, after about a month, I accidentally started the engine without giving it any throttle- I just turned the key. It started right away (miracle #1) AND idled smoothly at 700RPM (miracle #2). I could not believe it! I turned it off and started it again, and the same thing happened. Since then, it has done this every time. No blue smoke, no engine shaking, engine starts immediately and idles smoothly. That's my story. I don't know what they put into this product, but whatever it is it actually works. It restored my balky, high-mileage engine so it now starts and purrs like a baby. I would highly recommend this product, and that's an understatement. ### ⭐⭐⭐⭐ It's works!......I think *by B***H on May 28, 2026* This did seem to quiet my engine down a little ## Frequently Bought Together - Rislone High Mileage 4 6 8 Compression Repair, 16.9 oz. - Bar's Leaks 1000 High Mileage Engine Repair, 16.9 oz | Restores Performance, Increases Compression & Horsepower, Stops Leaks, Noise & Smoking - Bar's Leaks OS-1 Oil Seal Engine Oil Burning and Leak Repair, 16.9 oz. --- ## 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/13219571-high-mileage-4-6-8-compression-repair](https://www.desertcart.co.uk/products/13219571-high-mileage-4-6-8-compression-repair) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-08-11*