--- product_id: 287923766 title: "Rislone 4720 Cat Complete Fuel, Exhaust, Emissions System Cleaner, 1-Pack | Cleans Catalytic Converter, Reduces Emissions & Saves Gas, 16.9 oz" brand: "rislone" price: "VT12938" currency: VUV in_stock: true reviews_count: 13 category: "Rislone" url: https://www.desertcart.vu/products/287923766-rislone-4720-cat-complete-fuel-exhaust-emissions-system-cleaner-1 store_origin: VU region: Vanuatu --- # Boosts fuel efficiency + mileage Cleans combustion & exhaust systems Prevents costly repairs & CEL alerts Rislone 4720 Cat Complete Fuel, Exhaust, Emissions System Cleaner, 1-Pack | Cleans Catalytic Converter, Reduces Emissions & Saves Gas, 16.9 oz **Brand:** rislone **Price:** VT12938 **Availability:** ✅ In Stock ## Summary > 🚗💨 Clean fuel, clear roads, zero regrets. ## Quick Answers - **What is this?** Rislone 4720 Cat Complete Fuel, Exhaust, Emissions System Cleaner, 1-Pack | Cleans Catalytic Converter, Reduces Emissions & Saves Gas, 16.9 oz by rislone - **How much does it cost?** VT12938 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/287923766-rislone-4720-cat-complete-fuel-exhaust-emissions-system-cleaner-1) ## 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 - • **Maximize Every Mile:** Enhances power, performance, and fuel economy across gasoline, ethanol, and hybrid engines. - • **Warranty-Safe Formula:** EPA-registered and safe for oxygen sensors & catalytic converters—no risk to your new vehicle warranty. - • **All-in-One System Detox:** Deep-cleans fuel injectors, catalytic converters, oxygen sensors, and exhaust for peak engine health. - • **Drive Smarter, Not Harder:** Regular use every 5,000 miles keeps your check engine light off and emissions in check. - • **Trusted Legacy, Proven Results:** Backed by 75+ years of expertise—don’t gamble on your engine’s future with unproven brands. ## Overview Rislone 4720 Cat Complete Fuel, Exhaust & Emissions System Cleaner is a powerful, EPA-registered formula designed to clean and maintain fuel, exhaust, and emissions systems in all fuel-injected and hybrid vehicles. It removes carbon buildup, soot, and contaminants from critical engine components, improving power, mileage, and reducing emissions while preventing costly repairs and check engine light alerts—all without voiding your vehicle’s warranty. ## Description Fuel, Exhaust & Emissions, Systems Cleaner: CAT COMPLETE Fuel, Exhaust & Emissions System Cleaner has high-performing detergents and heavy duty cleaning solvents that effectively scrub and remove contaminants, soot, carbon build-up, and oily residue from the fuel injectors, combustion chambers, turbo, EGR, catalytic converters, oxygen sensors and the exhaust system. These along with other active chemical agents, react with the gases created in the combustion process to remove the remaining inorganic deposits. This process restores their function and with regular use maintains efficiency. As fuel is burned contaminating byproducts are created that get circulated throughout various vehicle components. The system is designed to be able to handle this process during most normal engine operation. However, the use of poor quality fuel, short driving distance, cold weather, improper maintenance, and component failure can greatly increase the amount of contamination and deposits created inside these systems. Such factors can cause increased exhaust emissions, reduced fuel economy, lost power & performance, drivability issues, engine overheating, hard starts, check engine light illumination and premature engine wear. Review: Product failed miserably - EDITED - Not much else to say, there. I followed the directions to the letter (driving more highway AND city than what's instructed) and P0420 remains on the OBD. I've been told now by two very experienced mechanics that these products rarely work - after now trying both Cataclean and this one, I now understand why they say this. EDIT EDIT EDIT!!! Just changed to 5-star because, although it took driving the car beyond what the instructions say, it has worked perfectly. P0420 is now gone, vehicle passed state inspection "with flying colors" and registration is complete. Key take-away: Give this more time to work if it doesn't do the job right away. I did nothing different - same gas as always (I fill up with Chevron or Texaco almost every time as they include Techron in their gas and my former racecar driver brother-in-law says that's the best). I do also add a bottle of Techron on occasion to give an extra "boost" to the cleaning power. Review: IT WORKED! - Worked for me! Believe me my tags renewal was approaching and I was stressing. Simply follow the directions. After the initial drive on a 1/4 tank of gas I filled up and drove about 15 miles a day until below 1/4 tank. My engine light didn't go off, but after filling up again and driving another 15 miles it still didn't go off. The second day I went to burn another 15 miles the light was off! Went immediately down to the emissions station, I was nervous but SHE PASSED! I been walking around with a smile all day. ## Features - Increase power, performance, mileage and save gas: Cleans by not only the entire emissions and exhaust system, but the fuel system as well. Works with gasoline, ethanol and hybrid vehicles. - Save on expensive fuel system and emission control repairs: Regular use every 5,000 miles tunes-up the fuel, emissions and exhaust systems keeping them clean and preventing the CEL light from returning. - Will not void manufacturer’s new vehicle warranty: Specifically designed and safe to use on vehicles which have oxygen sensors and catalytic converters. Exceeds EPA compliance performance criteria. - Works on all fuel injected, direct injected, carbureted, turbo, GTDI, Ecotec and EcoBoost engines. - DON'T GAMBLE ON AN UNPROVEN BRAND: A leaking engine, head gasket, cooling system, power steering or transmission is your one shot to avoid a bigger repair bill – reach for the brand proven for over 75 years ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08SPVQJ6J | | Best Sellers Rank | #7,373 in Automotive ( See Top 100 in Automotive ) #22 in Fuel System Cleaners | | Brand | Rislone | | Customer Reviews | 4.1 4.1 out of 5 stars (1,328) | | Date First Available | January 11, 2021 | | Item Weight | 1.08 pounds | | Item model number | 4720 | | Manufacturer | Bar's Products | | Manufacturer Part Number | 4720 | | Model | Cat Complete Fuel, Exhaust & Emissions System Cleaner, Check Engine Light Medic | | Product Dimensions | 9.25 x 2.65 x 2.65 inches | | Special Features | 50 state legal—EPA registered, Clear OBD P0420 & other OBD codes and turn check engine light off., Deodorizes sulphur “sulfur” (rotten eggs) exhaust smell., Pass emissions smog test, guaranteed. | ## Images ![Rislone 4720 Cat Complete Fuel, Exhaust, Emissions System Cleaner, 1-Pack | Cleans Catalytic Converter, Reduces Emissions & Saves Gas, 16.9 oz - Image 1](https://m.media-amazon.com/images/I/714GamXHUcL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: whats the deal with people saying it worked and then the engine light came back on?** A: We have not heard of this being a common thing with using our Cat Complete product. From our experience the light stays off for a very long period of time, especially if you use one every 5,000 miles to keep the system clean. If 6 months or longer have gone by and the light comes back on it may be the same issue reoccurring. If we can provide any further assistance, please don’t hesitate to email or contact us at 800-345-6572. We can be reached M-F, from 8 am to 5 pm Eastern time. **Q: Will it clear a P0411 code?** A: With the proper use of this product the vehicle CEL light will turn off if the vehicle has a code listed below, and/or that it will pass that state emissions test and has no other mechanical issue that is triggering the light: * OBD-II PID CODES P0138 P0139 P0143 P0144 P0145 P0146 P0151 P0152 P0153 P0154 P0157 P0158 P0159 P0160 P0163 P0164 P0165 P0166 P0171 P0173 P0174 P0175 P0420 P0421 P0430 P0431 **Q: After using it, do I hve to turn off the light myself? I have a toyota camry 2006** A: When the check engine light (CEL) or malfunction indicator light (MIL) illuminates, it has detected an engine system malfunction. Many auto parts stores offer free on board diagnostic (OBD) code checks, and inexpensive readers are available to purchase for do it yourself (DIY) checks. One of the most common codes is P0420 (along with related codes) for the emissions system that usually traces back to catalytic converter efficiency. If the converter is dirty or bad, likely something else caused this. CAT COMPLETE Fuel, Exhaust & Emissions System Cleaner not only helps with what may be causing the light to come on, but also the system that initiated the problem. Driving with CEL on can cause increased vehicle emissions, poor fuel mileage, reduced power, further engine damage beyond what the original problem is, and could eventually lead to vehicle breakdown. Sometimes the damage is so severe that cleaning will not help. For example, a converter that has operated with temperatures over 1300°F will start to melt inside and become permanently damaged. Or an oxygen sensor that is not dirty, but internally damaged. Your best chance of cleaning one of these systems is within the first few months of when the light comes on. However this formula can also work on a vehicle that has had the light on for years. Once the issue has been resolved, the light may continue to be on for a period of time. For some vehicles, it takes a few start/stop cycles for it to clear, others you may need to disconnect the battery for 15 minutes and leave the door open, then reconnect. See vehicle owners manual for resetting the CEL if applicable. If you have any other technical questions, feel free to contact our Technical Service Professionals at 800-345-6572 or if you would prefer you can use the contact us page on our website. **Q: Can I use this twice in a row, like to tanks of gas back to back, or is it bad?** A: Yes you can. It is usually suggested you do so if your check engine light regarding your emission system remains on. Using this product twice in a row will not damage anything in your engine or emission system. If your emission system is clean & no check engine light is on, it is recommended that you use this product once every 5,000 miles to maintain a clean system. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Product failed miserably - EDITED *by A***. on February 6, 2024* Not much else to say, there. I followed the directions to the letter (driving more highway AND city than what's instructed) and P0420 remains on the OBD. I've been told now by two very experienced mechanics that these products rarely work - after now trying both Cataclean and this one, I now understand why they say this. EDIT EDIT EDIT!!! Just changed to 5-star because, although it took driving the car beyond what the instructions say, it has worked perfectly. P0420 is now gone, vehicle passed state inspection "with flying colors" and registration is complete. Key take-away: Give this more time to work if it doesn't do the job right away. I did nothing different - same gas as always (I fill up with Chevron or Texaco almost every time as they include Techron in their gas and my former racecar driver brother-in-law says that's the best). I do also add a bottle of Techron on occasion to give an extra "boost" to the cleaning power. ### ⭐⭐⭐⭐⭐ IT WORKED! *by K***K on July 31, 2026* Worked for me! Believe me my tags renewal was approaching and I was stressing. Simply follow the directions. After the initial drive on a 1/4 tank of gas I filled up and drove about 15 miles a day until below 1/4 tank. My engine light didn't go off, but after filling up again and driving another 15 miles it still didn't go off. The second day I went to burn another 15 miles the light was off! Went immediately down to the emissions station, I was nervous but SHE PASSED! I been walking around with a smile all day. ### ⭐⭐⭐⭐⭐ I cannot believe it…IT WORKED!!! *by M***S on July 8, 2026* I was looking at close to 600 in repair costs for a new catalytic converter and install. After doing some research, I found that this is the best product IF you use it soon after the check engine light comes on. I used it as instructed and about half way through the filled tank the light went off and I passed inspection. Couldn’t be happier. Definitely recommend. Make sure to not let too much time go by. Use this asap and make sure you drive like you stole something when you first empty the container in your tanks for at least 30-40 miles before filling up. Follow those instructions!! Best of luck. ## Frequently Bought Together - Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas - Rislone 4700 Hy-per Fuel Complete Fuel System Cleaner, 16.9 oz. - Dura Lube Severe Catalytic and Exhaust Treatment Cleaner Fuel Additive, 16 fl. oz., (PN: HL-402409 PDQ3) --- ## 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.vu/products/287923766-rislone-4720-cat-complete-fuel-exhaust-emissions-system-cleaner-1](https://www.desertcart.vu/products/287923766-rislone-4720-cat-complete-fuel-exhaust-emissions-system-cleaner-1) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-09-10*