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BARS PRODUCT Fuel System Cleaner - 4720

<ul><li><strong>Emissions Reduction</strong>: Cleans fuel and exhaust system to reduce excess exhaust hydrocarbon, CO, and NO<sub>X</sub> emissions.</li><li><strong>Deposit Removal</strong>: Contains synthetic detergents to remove IVD intake valve deposits, CCD combustion chamber deposits, and other fuel deposits.</li><li><strong>Catalytic Converter Restoration</strong>: Reduces zinc and phosphorus catalyst contamination, restoring catalytic converter function.</li><li><strong>Sensor Cleaning</strong>: Cleans O2 Lambda oxygen sensor tip.</li><li><strong>Odor Elimination</strong>: Deodorizes sulfur exhaust smell.</li></ul>

<ul><li>Cleans Fuel And Exhaust System – Reduces Excess Exhaust Hydrocarbon, CO And NO X Emissions And Saves Gas</li><li>Contains Outstanding Synthetic Detergents To Remove IVD Intake Valve Deposits, CCD Combustion Chamber Deposits And Other Fuel Deposits</li><li>Reduces Zinc And Phosphorus Catalyst Contamination, Restoring Catalytic Converter Function</li><li>Cleans O2 Lambda Oxygen Sensor Tip</li><li>Deodorizes Sulphur Exhaust Smell</li><li>Helps Pass Emissions Smog Test, Guaranteed</li><li>No Supplier Warranty</li></ul>

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Ease Of Use

Check Engine Light

Instruction Clarity

Car Performance

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Value For Money

Engine Code Clearing

Catalytic Converter Cleaning

Engine Power

Quality

Scent

Fuel Efficiency

Fuel Mileage

Fuel Injector Cleaning

Features straightforward application process and easy instructions.

Offers good value compared to alternatives.

Bought this catalytic converter cleaner because my car was out here coughing like a 90-year-old smoker.

Poured it in the tank like “heal, old friend,” and I swear the check engine light blinked like, “…okay, I'll chill for now.” Car smells less exhaust-y, runs a little smoother, and I feel like a mechanic even though I did nothing but dump a bottle in the gas.

What it did:
	•	Made me feel responsible
	•	Quieted whatever gremlin was rattling in there
	•	Saved me from Googling “how much is a new catalytic converter” and crying

What it didn't do:
	•	Turn my 2010 into a Tesla
	•	Fix the mysterious rattle in the back that's 100% just kid stuff rolling around

8/10 — cheaper than the mechanic, easier than pretending I know what an O2 sensor does. 🛠️⛽️

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Awesome. I had Check engine light on with P0420 code on my  3rd Gen 4Runner. Added this according to instructions and within a few weeks light was off, power and fuel economy was restored. Past Emissions test. 
Saved $1,750 on purchasing  new Cat converter.

Worked great on my 3rd Gen 4Runner

Catalytic Converter cleaner and fuel exhaust by Rislone really does an awesome job. My 2004 Honda was running rough and I added Rislone to my fuel as per instructions and my Honda gets up and go when I press the pedal. I am sure that a dirty Catalytic converter was part of my rough and sluggish running. Not no more. Love it.

CLEAN YOUR CATALYTIC CONVERTER AND FUEL SYSTEM

My car check engine light came on and the code was saying I needed to replace the catalytic converter but all it needed. Was that stuff added to my gas tank and it cleaned out the exhaust system. It's working great save my car check engine light came on and the code was saying I needed to replace the catalytic converter but all it needed. Was that stuff added to my gas tank and it cleaned out the exhaust system. It's working great saved me a bunch of money. me a bunch of money.

Huge savings

We have a 2014 Ford Explorer limited with AWD and we have over 200,000. We would get the 4030 code ford bank %232 and we needed to pass for a upcoming emissions. We would clear the code but come back in like 30 to 150 miles as it got to 198,000 it came often. So went to YouTube and watched videos of what worked and how. This does work if you do it like the bottle instructs, now i bought 2 bottles because of how many miles and how often the check light came on and need the pass a emissions. So put the bottle in at 1/4 or quarter tank and then drove it on highway at 75mph to 100mph until 10 miles and filled up again like the bottle said. We left the check engine light on and after driving a little over a half tank we went the store and the light went off by itself. Now I'm going to do the other bottle when we go out of town this weekend because we are traveling over 500 miles so hopefully will update when we do emission in a week. it's not the cheapest because Ii paid $48 for 2 bottles but it's cheaper than a new catalytic. So hopefully this helps someone.

Everything I read said this was the best product of this type and I agree. The Sulphur smell went away and I got a boost in gas mileage. It's a Rislone product and they have never failed me.

Smell and Performance

I used this on my 2008 Nissan Versa with 208k miles, and saw immediate improvement after the first drive cycle.  I was getting an intermittent P0420 code (sometimes set, sometimes pending) and poor power.  I followed the instructions, and the car smelled like burning plastic after coming off the highway on the first drive.  The solvent cleaned something, but what exactly I don't know.   I also don't know how this compares to other less expensive fuel system cleaners, but this worked for me.  The car accelerates much smoother now and the code has not returned.

Worked for me

I just got this product earlier this morning and I turned off my check engine light this morning before day light so I'm going to go and look at how many miles and what the instructions of the company on what to be done and then I'll rate this product… stay tuned

my check engine light is on. This product guarantees that light will go out. I did the instructions exactly as written and the light never went off and is still on after 300 miles.

DOES NOT WORK! I bought this a second time after the first use did not clear the code. Used this both times per the directions. I had proof of purchase on Walmart's website, but didn't keep the packages. Rislone would not refund anything without the package material. That's fine, but it really did not work at all. WASTE OF MONEY!!!

WASTE OF MONEY!!!

Bar's Leaks Fuel System Cleaner 4720 Rislone, a 16.9 fluid ounce bottle designed to clean fuel catalytic converters and emission systems. The multicolour packaging highlights features such as reducing emissions, deodorizing sulphur exhaust smells, and helping pass smog tests. The product also cleans oxygen sensor tips, removes intake valve and combustion chamber deposits, and restores catalytic converter function. Suitable for automotive fuel additives.

BARS PRODUCT Fuel System Cleaner - 4720

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