Dura Lube Severe Catalytic and Exhaust Treatment | 16 oz., 6-Pack

Used one bottle as directed and about half way i went to the interstate to push it into passing gear so it would create more exhaust pressure. Has been 2000 miles and no engine light or code. Felt like it had more pep and ran smoother. Im a satisfied customer.

2009 Honda Accord Coupe 4 cylindersPer my research, if your car smells funny, this item wont work. If your car still runs smooth but having an engine light on for catalytic converter and a bad mileage, this item is for you to try.A few months ago, my car's engine light was on, code P0420, 130k miles. It can be a different code for your car, but a simple trip to O'Reilly to borrow a scanner showed code P0420 means catalytic converter isnt working properly. The nearest repair shop quoted me a 1k1 offer, which left me nothing but despair. After researched through my not-so-trusted friend, Google, I bought 2 of these. I ran the entire first bottle to a full gas tank. The mileage was restore to regular, the engine light was off the second half of the tank but eventually got back on again. I ran the next gas tank without any addictive, to make sure the first bottle was gone-gone. I emptied the second bottle to the third full gas tank. Bump, after 200 miles or so, no more engine light. I write this review a few months later, at 140k miles, and the engine light is still off for now. For your information, before the incident, I ran 92 at Costco, for a whole year. Now, 92 at Shell, or Chevron, which costs more. I dont know if gas plays a role in here, but they say all top tier gas is the same. Through my own experience tho, stay away from Arco, they may be cheap, but terrible gas mileage. I have never heard any complaints on Costco gas, but maybe it's just my car's converter has finished its lifetime early.

I drive a fairly old Honda Odyssey (2008) with 160+k miles, and have been getting P0430 (bank 2 catalyst below efficiency threshold). This engine has the variable cylinder control (VCM) which is known in some circles to cause a lot of oil consumption, especially on bank 2 cylinders, so I've disabled that feature, but still get the code, as my bank 2 catalyst is probably very very fouled.The bottle says, add 1 ounce per gallon, so I poured the 16 ounce bottle into a partially full gas tank (probably had about 12-16 gallons in there). After 100 miles of driving, the check engine light went away on its own and stayed that way till the end of the tank. Unfortunately, upon refilling the tank with new gas, the engine light came back pretty soon, but the fact that it worked once gave me some hope. Ordered a couple more bottles of this stuff.Prior to this, I've replaced spark plugs, all oxygen sensors, and tried the "LiquiMoly Catalytic Cleaner", which requires you to take apart the air intake and spray it directly into a running engine... which is annoying, and it didn't clear my engine codes permanently either. So, at least this is more user friendly, and I'll give it some more tries.

2005 honda crv has been throwing p0420 at me for months now on and off, finally decided I should do something about it. Filled my tank up almost all the way and put just about all but a little of this stuff in since it's 1oz per gallon. I drove through the mountains for 46 miles, turned my car off and on a few times when stopped. Right before my last stop I started to smell the carbon deposits burning up and knew it was working. Stopped for a few minutes and started it up, check engine light went off right away. I havnt even used a 1/4 of the tank but I will be throwing the other bottle in in a couple more tanks to make sure it's good.

I have a 2008 Town & Country with 209,000 miles.A few months ago I got code (p4020) …The code will not clear using a scanner but does go off after driving about 600 miles, stays off for about 250 miles but then comes on again…I figured I’d try this product to see if it works. It hasn’t as of yet. I added the product to my gas tank and have driven about 250 miles, but the check engine light has not gone off….I gave the product 1 star, but will update after I add a 2nd bottle to my next full gas tank.