--- product_id: 603801989 title: "Rislone 4784 DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner, 11.8 oz" brand: "rislone" price: "R811" currency: ZAR in_stock: true reviews_count: 8 category: "Rislone" url: https://www.desertcart.co.za/products/603801989-rislone-4784-def-crystal-clean-diesel-def-and-scr-emissions store_origin: ZA region: South Africa --- # Safe with DOC, DPF, SCR & DEF systems Use every 5,000 miles for peak performance Targets SCR system deposits Rislone 4784 DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner, 11.8 oz **Brand:** rislone **Price:** R811 **Availability:** ✅ In Stock ## Summary > 🚛 Keep your diesel running clean, lean, and mean with Rislone DEF Crystal Clean! ## Quick Answers - **What is this?** Rislone 4784 DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner, 11.8 oz by rislone - **How much does it cost?** R811 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/603801989-rislone-4784-def-crystal-clean-diesel-def-and-scr-emissions) ## Best For - rislone enthusiasts ## Why This Product - Trusted rislone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Warranty-Safe Formula:** Works seamlessly without voiding your vehicle’s new manufacturer warranty—drive worry-free. - • **Plug & Play Application:** Simply add to your DEF tank’s blue cap—no mechanic needed, no diesel fuel contamination risk. - • **Crystal Clear Efficiency:** Dissolves white crystallization deposits that clog your SCR system, restoring engine power and fuel economy. - • **Mileage-Optimized Maintenance:** Designed for regular use every 5,000 miles to prevent costly DEF system failures and keep emissions clean. - • **Universal Diesel Compatibility:** Compatible with all major DEF fluids including AdBlue, AUS 32, BlueTEC, and more—perfect for any diesel ride. ## Overview Rislone 4784 DEF Crystal Clean is a specialized emissions system cleaner formulated to dissolve harmful crystallization deposits in diesel SCR systems. Safe for use with all DEF fluids and emissions components like DOC, DPF, and SCR devices, it restores engine efficiency and reduces DEF consumption. Regular use every 5,000 miles prevents buildup, protects your vehicle’s warranty, and keeps your diesel truck or SUV running at peak performance. ## Description RISLONE® DEF CRYSTAL CLEANTM Diesel DEF & SCR Emissions System Cleaner is a propriety blend of DEF (Diesel Exhaust Fluid) / AdBlue® compatible cleaning agents and surfactant detergents specifically designed to be safe to use and work on SCR (Selective Catalyst Reduction) systems. DEF Crystal Clean gives a cleaning effect on the entire SCR system by working to dissolve the white crystal deposits that form in the tank, pump, heater, sender, lines, injector, decomposition tube / reactor and mixer. These deposits can interfere with the normal operation of the SCR emissions system and engine, increasing fuel consumption and reducing engine power. This reduced power can lead to operating in limp mode where the vehicle will drive slowly, or become undrivable. This process restores function and with regular use maintains efficiency of the SCR. DO NOT ADD TO DIESEL FUEL TANK. INSTRUCTIONS: DEF Crystal Clean is specifically designed to only be installed in the Diesel Exhaust Fluid / AdBlue tank which usually has a blue cap. Do not add to the diesel fuel tank. * Light Truck or Mid-Size to Large SUV - 5 to 9 gallon tank capacity install full bottle into DEF tank. *Car or Small SUV - 3 to 5 gallon tank capacity use approximately 1/2 bottle. *Medium and Heavy Duty Diesel Trucks - 10 to 20 gallon tank capacity use 2 bottles. Pour DEF Crystal Clean into mostly full DEF tank or add and fill tank with diesel exhaust fluid. If light is still on after 250 miles or a few days of driving, second application may be required, or mechanical attention is needed. NOTE: Works with all approved diesel exhaust fluids. Some vehicles use a special filling adapter to install DEF / AdBlue into the tank. For those vehicles use special funnel or pour into mostly empty DEF / AdBlue bottle and install in system. Review: 2016 Ram 1500 Ecodiesel DEF Consumption - We have a 2016 Ram 1500 Ecodiesel and prior to using this product I was eating up half a tank of DEF every month. I ran back to back bottles and started using the DEF at our local Fry’s store. The DEF consumption went down dramatically. Folks, this stuff really works. We are having to fill the DEF every two months now. Fantastic product and works extremely well. Review: Good for cleaning DEF systems - Had crusting in DEF system on truck and this helped reduce it without taking it to a dealer to get it fixed. ## Features - Excellent for diesel vehicles driven regularly at slow speeds, low loads, short durations or make frequent stops as these are more prone to having the problem of crystallization deposit build up in the SCR system. - Regular use every 5,000 miles not only keeps the system clean, but works to prevent the white crystallization issues from returning. - Will not void manufacturer’s new vehicle warranty. Specifically designed and safe to use on vehicles which have DOC catalytic converters, DPF particulate filters, SCR selective catalytic reduction devices, ASC ammonia slip catalyst or DEF / AdBlue systems. - Works with all AdBlue, Aria 32 (Automotive Nitrogen Oxide Liquid Reducing Agent), AUS 32 (Aqueous Urea Solution), BlueHDi, BlueTEC, Cummins, DEF UREA, Duramax, EcoDiesel, PowerStroke, TDI Clean Diesel, and many more. - DEF Crystal Clean is specifically designed to only be installed in the Diesel Exhaust Fluid / AdBlue tank which usually has a blue cap. Do not add to the diesel fuel tank. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CRSY78LR | | Best Sellers Rank | #3,195 in Automotive ( See Top 100 in Automotive ) #14 in Fuel System Cleaners | | Brand | Rislone | | Customer Reviews | 4.5 4.5 out of 5 stars (510) | | Date First Available | January 9, 2024 | | Item Weight | 15.2 ounces | | Item model number | 4784 | | Manufacturer | Bar's Products | | Manufacturer Part Number | 4784 | | Model | Diesel DEF & SCR Emissions | | Package Dimensions | 9.02 x 2.76 x 2.72 inches | | Special Features | Automotive | ## Images ![Rislone 4784 DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner, 11.8 oz - Image 1](https://m.media-amazon.com/images/I/71hRUzjYRyL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 2016 Ram 1500 Ecodiesel DEF Consumption *by T***Y on January 25, 2026* We have a 2016 Ram 1500 Ecodiesel and prior to using this product I was eating up half a tank of DEF every month. I ran back to back bottles and started using the DEF at our local Fry’s store. The DEF consumption went down dramatically. Folks, this stuff really works. We are having to fill the DEF every two months now. Fantastic product and works extremely well. ### ⭐⭐⭐⭐⭐ Good for cleaning DEF systems *by J***D on March 7, 2026* Had crusting in DEF system on truck and this helped reduce it without taking it to a dealer to get it fixed. ### ⭐⭐⭐⭐⭐ It works excellent. *by A***R on March 29, 2025* As always, I'm skeptical when it comes to product performance—but this one? Amazing. I never owned a diesel until I bought my '21 GMC HD2500 Duramax. I love it, but man, diesel engines demand preventive maintenance. You can't wait for things to break—you’ve got to stay ahead of it with products that help reduce or even prevent issues. This particular product is excellent. Since the day I bought my truck, I’ve had nonstop problems with the DEF tank sensors sticking. Sometimes it would show full when I knew it wasn’t, and other times it claimed to be half empty right after a fresh fill-up. Totally unreliable. And what did the dealer say? “It’s inadvertent.” That word should be banned—it’s just an excuse to ignore a real problem. Let me tell you—this product works. Period. And it worked fast, too. Absolutely amazing. ## Frequently Bought Together - Rislone 4784 DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner, 11.8 oz - Rislone 4780 Diesel DEF Treatment | Prevents AdBlue/DEF Fluid Crystallization, 8 oz - Rislone® 4744 DPF Clean™ Diesel DPF, Exhaust & Emissions System Cleaner, 16.9 oz, 1-Pack --- ## 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.za/products/603801989-rislone-4784-def-crystal-clean-diesel-def-and-scr-emissions](https://www.desertcart.co.za/products/603801989-rislone-4784-def-crystal-clean-diesel-def-and-scr-emissions) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-04-24*