--- product_id: 5311765 title: "Mercury 8M0047931 Quickleen Engine & Fuel System Cleaner, 12 oz" brand: "mercury" price: "£23.58" currency: GBP in_stock: true reviews_count: 9 category: "Mercury" url: https://www.desertcart.co.uk/products/5311765-mercury-8m0047931-quickleen-engine-and-fuel-system-cleaner-12-oz store_origin: GB region: United Kingdom --- # 1 oz treats 5 gallons fuel Removes stubborn carbon deposits OEM-spec engineered for peak performance Mercury 8M0047931 Quickleen Engine & Fuel System Cleaner, 12 oz **Brand:** mercury **Price:** £23.58 **Availability:** ✅ In Stock ## Summary > ⛽ Clean fuel, smooth ride, zero compromises. ## Quick Answers - **What is this?** Mercury 8M0047931 Quickleen Engine & Fuel System Cleaner, 12 oz by mercury - **How much does it cost?** £23.58 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/5311765-mercury-8m0047931-quickleen-engine-and-fuel-system-cleaner-12-oz) ## Best For - mercury enthusiasts ## Why This Product - Trusted mercury brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Engine Guardian:** Prevents knocking and piston seize-up, extending engine life and reliability. - • **Deep Carbon Detox:** Eradicates deposits from carburetors, injectors & valves for a cleaner engine. - • **Trusted OEM Quality:** Crafted by Mercury Marine with decades of engineering excellence behind it. - • **Versatile Powerhouse:** Safe for all 2-stroke & 4-stroke engines, from marine to motorcycles and lawn gear. - • **Fuel Efficiency Booster:** Just 1 oz revitalizes 5 gallons of gasoline, maximizing every drop. ## Overview Mercury 8M0047931 Quickleen Engine & Fuel System Cleaner is a premium 12 oz additive designed to remove carbon buildup and prevent engine knocking across a wide range of gasoline engines. Engineered to OEM standards by Mercury Marine, it treats 5 gallons of fuel per ounce and is safe for both 2-stroke and 4-stroke engines, ensuring enhanced performance and longevity for vehicles and equipment alike. ## Description Put a halt to fuel-related issues with Mercury Quickleen Engine and Fuel System Cleaner 8M0047931. Designed to be used throughout the season, Quickleen quickly and thoroughly removes carbon deposits from internal engine components. It also prevents engine knocking and piston seize-up, and can help extend spark plug life. Part of the complete Mercury Fuel Care System, Quickleen is safe for use in all 2‑stroke and 4‑stroke carbureted and fuel‑injected gasoline engines, including cars, trucks, motorcycles, ATVs, snowmobiles, marine engines, lawn mowers, chainsaws, string trimmers and snow blowers. Safe for catalyzed engines. 1 ounce treats 5 gallons of fuel. Review: This stuff works well. - Excellent product. Got my motor running in tip top shape. Goid value. Review: Worth the price. - Honestly when you're doing marine engineering work this product is top notch. Exceeded expectations. I use this multiple times through out the year and I noticed a difference. Quality fuel system cleaner. Not cheap but works. ## Features - Removes carbon deposits from carburetors, injectors, intake valves, spark plugs, piston crowns and cylinder heads - Prevents engine knocking and piston seize-up - Use occasionally throughout the season - just 1 ounce treats 5 gallons of gasoline - Produced by Mercury Marine to our stringent original equipment manufacturer specifications - Does not contain fuel stabilizers. Use Mercury Quickare to prevent fuel breakdown and oxidation. - Mercury oils, lubricants and engine care products are backed by decades of experience in engineering, testing and manufacturing to provide the best protection and performance. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003ZF1GJQ | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #12,660 in Automotive ( See Top 100 in Automotive ) #38 in Fuel System Cleaners | | Brand | MERCURY | | Brand Name | MERCURY | | Compatible with Vehicle Type | Watercraft | | Customer Reviews | 4.8 out of 5 stars 830 Reviews | | Included Components | 1 Bottle | | Manufacturer | Mercury Marine Mercruiser | | Manufacturer Part Number | 8M0047931 | | Manufacturer Warranty Description | 1 Year | | Model Number | 8M0047931 | | Number of Items | 1 | | Number of Packs | 1 | | OEM Equivalent Part Number | 8M0047931 | | Thread Size | RM | | UPC | 745061870192 | | Vehicle Service Type | Watercraft | ## Product Details - **Automotive Fit Type:** Vehicle Specific Fit - **Brand:** MERCURY - **Thread Size:** RM - **UPC:** 745061870192 - **Vehicle Service Type:** Watercraft ## Images ![Mercury 8M0047931 Quickleen Engine & Fuel System Cleaner, 12 oz - Image 1](https://m.media-amazon.com/images/I/51EhZmXtA7L.jpg) ## Questions & Answers **Q: o2 sensor safe ?** A: This is used for Marine Engines ie Mercury brand, in which they don't have o2 sensors. If your using it in a car, your wasting a ton of money vs STP or something and i will ruin o2 sensor on a car **Q: Is this how they call quickleen lubricant** A: Hi too the best of my knowledge it is fuel system cleaner nothing more however it may have some lubricating qualities. I do know that it works well if you use it on a regular basis.I use quickleen 1 with every fill up along with stabil for marine use it helps keep the moisture out of the fuel system. **Q: will this cleaner free up compression relies valves?** A: I use this more on the preventative side and not fixing carbon build up or other material build up. I do understand you can use a higher dose of this additive and run the engine at lower rpms to help eliminate some of the build up. All depends on how dirty your valves have gotten. I have been using this additive for the past three years or almost 1800 hours on my engine. I have never had any issues with build up. **Q: Does it also act as a gass stabilizer for winter storage?** A: It is a fuel system and injector cleaner. I used Marine Stabilizer in my fuel tank for winter storage. ## Customer Reviews ### ⭐⭐⭐⭐⭐ This stuff works well. *by R***. on May 3, 2026* Excellent product. Got my motor running in tip top shape. Goid value. ### ⭐⭐⭐⭐⭐ Worth the price. *by J***. on December 1, 2025* Honestly when you're doing marine engineering work this product is top notch. Exceeded expectations. I use this multiple times through out the year and I noticed a difference. Quality fuel system cleaner. Not cheap but works. ### ⭐⭐⭐⭐⭐ Excellent product *by M***K on December 31, 2025* Really good stuff. Notable performance improvement after using this ## Frequently Bought Together - Mercury Quickleen Engine & Fuel System Cleaner - Mercury Marine Quickare Fuel Treatment, 12 Ounces 92-8M0047930 - Mercury Marine 12oz Quickstor Fuel Stabilizer Treatment 92-8M0047932 --- ## 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/5311765-mercury-8m0047931-quickleen-engine-and-fuel-system-cleaner-12-oz](https://www.desertcart.co.uk/products/5311765-mercury-8m0047931-quickleen-engine-and-fuel-system-cleaner-12-oz) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-30*