Within one year, this product has become a worldwide bestseller.
Introducing Rislone Cat Complete Fuel, Exhaust & Emission System Cleaner – the most advanced catalytic converter and emissions product available anywhere.
This formula is engineered to help you clean dirty catalytic converters, clear common OBD check engine light (CEL) codes, pass emissions testing and improve the overall health and performance of your fuel system. It’s one of the most advanced formulas we’ve developed in our 100+ year history.
Part Number: 4720
Dosage: Add entire bottle into approximately 1/2 full tank car or small to mid-size SUV (1/4 full tank truck or large SUV) of gasoline.
Size: 16.9 FL. OZ. (500 mL)
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.
Yes, many times it can, especially if you catch it early and it is not completely blocked.
P/N 4720 / 16.9-ounce bottle – One full bottle is used to treat a normal passenger car, SUV or light truck vehicle.
Yes, instructions must be followed to receive the best results. Add entire bottle of CAT COMPLETE™ Fuel, Exhaust & Emissions Systems Cleaner into approximately 1/2 full tank for car or small to mid-size SUV, (1/4 full tank for truck or large SUV) of gasoline. Drive vehicle 20 to 30 miles, ideally half at highway speeds and then fill up tank. Continue to drive vehicle normally until below 1/4 tank before refueling. Take emissions test at this time if needed and CEL light should be off. Depending on the severity and length of time light has been on, it may take an extra 250 miles with multiple cycles of the vehicle being started and turned off for the light to reset. If light is still on mechanical attention is needed.
Regular use every 5,000 miles tunes-up the fuel, emissions and exhaust systems, keeping them clean and preventing the CEL light from returning. This also saves on expensive fuel system and emission control repairs.
Yes, Rislone CAT COMPLETE Fuel, Exhaust & Emissions System Cleaner works with all regular unleaded, premium, oxygenated, and E10 E15 E85 ethanol containing flex fuels.
No, Rislone CAT COMPLETE is only designed to be used with gasoline engines. Use Rislone DPF CLEAN part number 4744 for diesel vehicles.
As fuel is burned, contaminating byproducts are created that get circulated throughout various vehicle components. These systems are 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 create and greatly increase the amount of contamination and deposits inside these systems.
The catalytic converter, sometimes called the catalyst or “cat”, is an emission control device mounted in the vehicle exhaust system that contains a catalyst which converts toxic pollutant gases into less harmful gases. A motor vehicle can have one or more of these. There are multiple designs including honeycombed and bead shape, which are coated with precious metals like palladium, rhodium and platinum.
Vehicle manufactures say that the catalytic converter should last the life of the vehicle, but in the real world this is usually not the case. Many things can cause the converter to go bad or fail, but in most of these cases it was not the fault of the converter itself, it was something else which poisoned or ruined the converter. Some examples would be a bad head gasket where coolant enters the exhaust, poor piston rings causing the engine to burn oil, dirty fuel injectors, clogged fuel filter and even driving many short trips can shorten the life of the converter, among many others.
A poison to the catalytic converter or oxygen sensor is any substance that coats its surface and no longer allows it to react with the exhaust gasses. Lead, which used to be in gasoline, was the number one poisoning substance, and one of the reasons it has been removed from fuels. Zinc and phosphorus in engine oils are other potentially damaging substances, especially if the vehicle is burning oil. Burned engine coolant (ethylene glycol) is also bad, which happens when a head gasket fails. Silicone, commonly found in gasket sealants, have also been known to harm catalytic converters.
Because of the increased backpressure that builds up from a clogged catalytic converter, the vehicle will have drivability issues like low power and performance, reduced fuel economy, hard starting, stalling, increased emissions and check engine light illumination.
No, this will not harm your engine or any emissions components. This product is specifically designed to be safe to use on vehicles which have oxygen sensors and catalytic converters. Likewise, it will not void manufacturer’s new vehicle warranty. Exceeds EPA compliance performance criteria.
Yes, this can help with multiple causes of the strong sulfur (rotten egg) smell relating to an incorrectly functioning catalytic converter or some of the fuel system problems that contribute to this issue.
Using a product like Rislone Fuel, Exhaust & Emissions System Cleaner should be the first step before replacing the catalytic converter. This not only gives the vehicle the best chance of being repaired affordably, but also works to fix a contributing issue which may have caused the problem with the converter.
The number one check engine light code is P0420 – It has sister related codes which are P0421, P0430 and P0431. These codes mean that the efficiency of the catalytic converter is below its functional threshold.
In extremely dirty systems a second treatment may be beneficial. Because the product is so concentrated, run a full tank of gas through the vehicle before adding the second bottle.
Yes, this is a great product to use in a hybrid vehicle. You may need to override the hybrid system so that the gasoline engine continues to run while using this product for a complete cleaning.
Yes, this multi-vehicle formula works with all fuel injected, port fuel injection (PFI), direct injected (DI / DIG), gasoline turbo direct injected (GTDI), turbocharged and carbureted engines.
Yes, this is safe to use and works in all domestic and import turbo charged and directed injected gasoline (GDI / GTDI) engines like the Ford EcoBoost, GM Ecotec and all others.
Many factors can cause this including something as simple as a loose or missing gas cap. Other common items are a bad or clogged catalytic converter, damaged or dirty oxygen sensor, failed ignition coil/spark plugs/wires, dirty mass air flow (MAF) sensor, bad EVAP purge control valve, clogged fuel injectors.
Many retail auto parts stores offer free on-board diagnostic (OBD) code checks, and inexpensive code readers are available to purchase for do it yourself (DIY) checks.
When the check engine light (CEL) or malfunction indicator light (MIL) illuminates, it has detected an engine system malfunction.
Many states or regions require regular emissions inspections before renewing vehicle plates or the first time registering. During a visual inspection if there are missing or tampered emissions components, that can be an automatic failure. It also could be something simple like a missing gas cap or a cap with a bad seal. Defective mechanical parts that have failed would be another reason. Many times, it does not take a mechanical issue to cause a failed result on a vehicle emissions test. If you are unsure your vehicle will pass, or maybe it barely passed the last test, we recommend a fresh oil change and emissions system cleaning with Rislone Fuel, Exhaust & Emissions System Cleaner before testing. Other items to consider include spark plugs and fuel filter, if they are due for replacement. This gives your vehicle the best chance of passing.
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.
INSTRUCTIONS:
Add entire bottle of Fuel, Exhaust & Emissions Systems Cleaner into approximately 1/2 full tank car (1/4 full tank truck) of gasoline. Drive vehicle 20 to 30 miles (ideally half of these miles at highway speeds), and then fill up tank. Continue to drive vehicle normally until below 1/4 tank before refueling. Take emissions test at this time (if needed) and CEL light should be off. Depending on the severity and length of time light has been on, it may take an extra 250 miles with multiple cycles of the vehicle being started and turned off for the light to reset. If light is still on mechanical attention is needed.
NOTE:
This bottle is designed to work in ALL gas tanks including standard, obstructed and capless (no fuel cap) systems. If vehicle has a fuel cap make sure to reinstall tightly, as this can cause the light to be on.
MONEY BACK GUARANTEE
Rislone guarantees, with the proper use of this product, that your vehicle CEL light will turn off if the vehicle has a code listed below, and/or that it will pass that state emissions test. Visit www.cel-reset.com/refunds for details of product refund and requirements.
* 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
CHECK ENGINE LIGHT
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.
EMISSIONS SMOG TEST
Many states or regions require regular emissions inspections before renewing vehicle plates or the first time registering. During a visual inspection if there are missing or tampered emissions components, that can be an automatic failure. It also could be something simple like a missing gas cap or a cap with a bad seal. Defective mechanical parts that have failed would be another reason. Many times, it does not take a mechanical issue to cause a failed result on a vehicle emissions test. If you are unsure your vehicle will pass, or maybe it barely passed the last test, we recommend a fresh oil change and emissions system cleaning with Rislone Fuel, Exhaust & Emissions System Cleaner before testing. Other items to consider include spark plugs and fuel filter, if they are due for replacement. This gives your vehicle the best chance of passing.
Rislone products are available where auto parts are sold.
Get a $10 rebate with the purchase of our Rislone Cat Complete Fuel, Exhaust & Emission System Cleaner.
Offer is good through December 31st, 2026.
Click here to submit your receipt
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Don’t just take our word for it. Our customers have been using our products for decades.
If you have a story to tell, let us know.
“Would highly recommend. 2005 Chrysler Pacifica, 145k and does the Chrysler oil burn. Had a PO420 two weeks before having to have emissions done. With looking at 800 to 1800 bucks to D.I.Y. a cat replacement or mad scientist bench clean it attempt I decided to gamble 40 bucks on Rislone. What’s 1540 compared to 1500 if it didn’t work. Added bottle with 1/4 tank. Ran it empty on highway. Refueled, In less than 10 mi check engine light turned off and had a noticeably drastic increase in power and performance. Passed emissions.
TL;DR, had “cat” code, bought bottle. Followed directions. Worked almost immediately. Passed emissions.”
-Neal
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