Dura Lube Severe Catalytic and Exhaust Treatment Cleaner Fuel Additive, 16 fl. oz., (PN: HL-402409 PDQ3)

I don't want just to say it works without giving details, but it could be hard as there is no objective data or measurement to present. I will try to tell the long story short, and you can see how it is working. 2005 Honda Pilot, over 190k miles. Late 2019, the check engine light came on for the first time while I am driving and it went off before I could brought it to the shop to check. I mentioned it to the mechanic when brought my car to do maintenance, he checked it and said the it was catalytic converter and asked me to just pay attention, and probably no need to do any check or fix soon. The light came back on and then off maybe a handful of times, but remained off for the most. The car passed the emission inspection at the end of 2019 without any problem. 2020, due to Covid and work from home for over nine months out of the year, I did not drive the car much the entire year, probably about 300 miles a month(used to be 1.3k - 1.5k miles a month). The check engine light came on and off became worse and worse. I bought a code reader and checked it, it is P420. I kept on discussing with my mechanic he kept on saying it probably not worth the effort and money to diagnose and fix, and if it can pass the emission, it should be okay. By the end of the year, I was driving with the check engine light on around 80 to 90% of the time. The light did go off once a while but it would come back on shortly. The car passed the emission test again in December. While discussing about the check engine light with the gentleman who ran the emission test, he told me that there might be some cleaner I can use to see if it could correct the issue. That lead me to buy this. During the first bottle with about 16 gallon of gas, the check engine light went off after about 50 miles of driving, stayed off for about 80 miles, then came on again and stayed on for another 60 or 70 miles, then off and on again right around time the tank was near empty (240 miles). I got another tank of gas without the cleaner, about 30 miles later, the light went off, and now I have about 150 miles with this tank of gas it has stayed off. My conclusion is that it is very clear, this cleaner works. I plan to get a few more bottles and continue to use it until the check engine light stays off for good.

This was added to a car that's around 12 years old that had the check engine light come on periodically. It was taken in to get an inspection and failed due to a fail on the catalytic converter. The estimate for the repair was about $2500 because the catalytic converter is attached to the exhaust manifold and the labor to get it all taken apart and put back together is substantial. The car wasn't really worth the repair given the mileage on it, but we weren't ready to buy a new car just yet. We decided to roll try this out to see if we could pass emissions one last time and have more time to shop for a new car. It was easy enough to use... add it to the gas at the next fill up and drive. It took a few days to get a little past the halfway mark before the check engine light went out. We took it in, it passed inspection, and we got the sticker. The light came back on a couple of days later, but turns off for about 30-60 miles every so often. We didn't notice any other benefits... performance and mileage were about the same as before. This may work as a preventative for some people, but we were long past that point. This isn't going to fix a car's catalytic coverter, but it'll buy you some time before you get a repair or get a new car and sometimes that's all you need!

Ran 1 bottle added to 1/2 tank gas in Subaru Outback with 214K miles, vastly improved performance followed by 2nd bottle added to 1/2 tank and it did not seem to improve past just 1 bottle. Did not make ODB2 lights go off. fast delivery, good value, and I will buy again.

This SAVED ME from an expensive fix. Too bad no car mechanic wanted to give me the scoop! My car had been jerking at low speeds due to a clogged converter. Car shop wanted to charge me an arm and a leg to replace it and gave me no alternative solution. Found this product from YouTube vids and then read the reviews! I had nothing to lose so I put this in my gas tank when it was half a tank and drove it for an hour. My car usually jerked every time I accelerated from a stop. Eventually the more I drove it, the jerking wasn’t so rough… then it started to jerk every other stop. Then only one jerk every other stop… then only jerked after a couple miles of driving. And now, it doesn’t jerk at all and no check engine light!! Omg I’m sooooo thankful for this product! My car is also driving much better in general! It did great for my car! The thing is, it won’t fix right away… the more you drive is the more it’ll run through the converter and clean it so don’t think it’ll work after just 1 hour etc. Also if your clog is super bad, use 2 bottles. First bottle -let it be concentrated so put it in when you are at a quarter tank of gas and run it to almost empty. Then put the Second bottle in with an almost full tank of gas! This will declog for sure! Don’t waste money buying a new catalytic converter before trying this.

After using one tank of petrol, my engine light is still on. Does seem to be effective.

Still the code is appearing P0420, no use

Check engine light still there but the car is smoother

Fix the knocking on my car for a while..

En una Outlander 2007 empezo a marcar un codigo, no recuerdo el numero pero era relacionado a "Catalitic Converter Upper Threshold Bank 2" y estaba a punto de cambiarlo $$$ :(, pero decidí probar con este producto, al principio no cambio nada, pero a la 2da semana despues de vaciar el tanque y rellenarlo, el codigo desaparecio y ya va mas de 2 meses que no marca ningun problema, así que debes de tener paciencia para que haga efecto y limpie perfectamente tu convertidor. En mi caso la camioneta tiene 3, el que va en el escape y 1 a cada salida de las cabezas de motor en mi caso un V6 3.0L con 2 cabezas. Genial y super recomendado. Pero repito, hay que tener paciencia y no desesperar por ver el testigo de motor ahi encendido. Pense en resetearlo yo pero ha lo habia intentado anteriormente y volvia aparecer, antes de probar con este producto de DuraLube.