Cataclean (120007-2PK) Fuel and Exhaust System Cleaner - 16 fl. oz., (Pack of 2)

I haven't yet had any problems with the CEL or smog-test results with my 1995 orphaned Isuzu Trooper LS. But I have kept spreadsheets with dates, mileage, expenses and smog-test results for the vehicle since I bought it used in 2002. CA requires me to smog-test the car every two years for annual registration, and CA has some tough standards. Worse -- they made the emissions standards tougher across the board in 2008. I understand, though: There was a time during the late 1960s when the smog here was so bad, I couldn't see the time on the university bell-tower from the edge of campus, and I could taste the air. It had a flavor like sour milk.Reviewing the smog-test results over the lasts 20 years, I see that the HC and NOx results are edging up. Further, the HC result for December, 2021 was 59, and the maximum allowable was 60. Well, folks, I aim to stave off disaster. What would that disaster be, anyway?I budget $1,000 annually for repair and replacement on my Trooper. Sometimes I exceed budget; sometimes I'm under budget. But I invested more than the budgeted amount over the last 5 years with various restorations and parts replacements. If added to the average expense of my ownership for the last 20 years together with the monthly insurance premium, the vehicle has cost me about $180 per month over 20 years with the original purchase price also included in the average. Not bad for a luxury SUV, when the car-mortgage and insurance over the same time for three successive new-car replacements less trade-in or resale value might be two or three times as much.Replacing the catalytic converter, the heated-oxygen sensor and ancillary exhaust parts would cost at least $1,000, assuming I can find the part. If it can be avoided, I'll be better off. This Trooper, in the sunset of the petroleum age, will likely outlast me in my own sunset years.I followed the directions, realizing that a person would like to get the full value out of a $30 bottle of Cata-Clean. So I found a 15-mile stretch of highway, with gas-stations at either end, and drove two miles to the nearest station with a quarter-tank of gas and the Cata-Clean in the tank. I ran the vehicle down the highway, then added exactly 1 gallon of gas for safety, returned to the first gas station, added another gallon, repeated the trip a few times until finally filling the entire tank.The vehicle runs noticeably better. I will repeat this operation in three months and then again, until my smog-test in December 2023. I hope to see some good results. Platinum doesn't deteriorate. So if the product does as promised, the cat-converter should be totally renewed. If I spend $150 on the product and save the $1,000 expense, my year-long project will be totally successful.How does it work? The product creates carboxylic acid for the exhaust, which cleans the cat-converter. There is no damage to the metal parts, and of course the manufacturer recommends using it every three months or so. Cata-Clean is recommended by smog-test technicians, and my retired-mechanic cousin, who has read up on the product, also seems to think it will be effective.

My mechanic is a guy whose been around cars for, like, 50 years. He swore by this stuff. I choked on the price but went for it. Zero regrets. Zero. This stuff is great! I would buy again, and again, and again.

It worked on an old Lexus. The check engine light stayed off for 6 months.

There are a ton of fuel additives out there, and most of them are fine, if not miraculous. I saw a good independent test of additives that included Cataclean, and it did clearly do a good job of cleaning several parts of the fuel and exhaust system. It's really meant for high-mileage cars, both to clean them out and improve performance and to extend the life of the catalytic converter. It probably works best if you don't wait to use it until you're having problems.I use it as a preventive measure, twice a year. Follow the directions, and you should be fine. Don't try using two bottles instead of one, or something. I didn't notice a big difference after using it, but my car is well into its second hundred thousand miles and still running fine. I just don't want the catalytic converter to build up a lot of soot in the first place.Berryman B-12, Seafoam, and Marvel Mystery Oil also do very well in independent tests as engine and fuel system cleaners, but Cataclean is specifically designed to help clean the catalytic converter as well. Considering what it costs to replace the catalytic converter, and what a pain it is to remove them and clean them, a little maintenance seems worthwhile.

This is a high quality fuel and exhaust system cleaner! I have used this product over many years! I highly recommend this product!

Did not do much. did not removed the p0420 code..

My son's 03 Subaru Baja's CEL came on with CAT issues. Poured a bottle in and few days later, lo and behold, the CEL turned off by itself. Is it a permanent fix? Don't know but it's working so far.

I’ve tried this two different times, and it did not work to be able to smog my car. Way too expensive for the gamble.

Maravilloso, solucionó el problema, incluso noté que ya no se siente muy caliente la máquina

Good product but a little pricey especially if you are going to use every oil change.

Funciona bien como último recurso o mantenimiento preventivo para reducir la acumulación de hollín y mejorar el rendimiento, pero no reemplaza la necesidad de un convertidor nuevo si este está desgastado. puede funcionar para pasar pruebas de emisiones en vehículos con acumulación de carbono moderada.

The produce required me to drive for awhile before kicking in but I was well aware of that

The shipping was super fast and my undamaged