Search  for anything...

Rislone 4720 Cat Complete Fuel, Exhaust, Emissions System Cleaner, 1-Pack

  • Based on 1,339 reviews
Condition: New
Checking for the best price...

Buy Now, Pay Later


As low as $6 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Sunday, Oct 18
Order within 20 hours and 6 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Style: 1-pack


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 manufacturers 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

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.

Manufacturer: ‎Bar's Products


Brand: ‎Rislone


Model: ‎Cat Complete Fuel, Exhaust & Emissions System Cleaner, Check Engine Light Medic


Item Weight: ‎1.08 pounds


Product Dimensions: ‎9.25 x 2.65 x 2.65 inches


Item model number: ‎4720


Manufacturer Part Number: ‎4720


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.


Date First Available: January 11, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Oct 18

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • It works
Style: 1-pack
This product is great. I have bought it twice and it makes my suv drive like new. First time had engine light on but after using about 2-3 days light went off. I've told my children and they purchased it as well.
Reviewed in the United States on September 17, 2026 by Lesha

  • Product failed miserably - EDITED
Style: 1-pack
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. ... show more
Reviewed in the United States on February 6, 2024 by Andy L.

  • Works Temporarily
Style: 1-pack
It did turn off my check engine light for my catalytic converter until my next fill up. Didn't work again.
Reviewed in the United States on August 27, 2026 by James Bunch

  • IT WORKED!
Style: 1-pack
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. ... show more
Reviewed in the United States on July 31, 2026 by KIRK

  • Rip-off
Style: 1-pack
Useless product i put this in my gas tank and noticed zero difference. I bought two bottles, but because of their ridiculous 'no returns or exchanges' rule, I am stuck with the second one. What a rip-off and a waste of money.
Reviewed in the United States on August 24, 2026 by SANDER JULIAN

  • I cannot believe it…IT WORKED!!!
Style: 1-pack
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. ... show more
Reviewed in the United States on July 8, 2026 by Michael R. Solis

  • It may help
Style: 1-pack
Used it per directions. Light went off for a tank or 2 and then came back on. Easier to pour in the tank than to try and replace cats. It may work in some situations but in mine it was short lived.
Reviewed in the United States on March 13, 2026 by Christopher Boston

  • Follow the directions! Worked great for small car/tank
Style: 1-pack
Rarely leave reviews but this stuff worked for me! Vehicle renewal coming up and CEL had kicked on, it's been weird kicking on and off for a bit but always reading the same code and having no changes in performance/mileage but this time it had been on for a bit. Was getting worried with the renewal coming up so soon and tried this on a hail mary and it worked. I have a small tank (9.2 gal) so I'm wondering if the higher concentration helped in my case. I followed the directions to a T, added stuff to a half tank, did some good speed highway driving and then some in city start/stop for the 20-30 miles they recommend. I felt like going 30 is better because the concentration of cleaner/gas is higher at this stage so you're using that treated fuel. Then I filled the tank and drove roughly 30 more miles of mixed driving, got home light still on. Later went to grab some takeout, started car and light turned off! I turned car off, took wifes car to get the food and first thing this morning drove to the inspection place and passed I'd say follow the directions to a T but also lean towards whatever leaves a higher concentration of the cleaner. I also used Premium the entire time for everything. I had even filled a tank of premium before all this hoping it might clear. The car also seems to be running a little more quiet and smooth right now ... show more
Reviewed in the United States on May 19, 2026 by Eric

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...