My most recent experience with Berryman B-12 ChemTool. I have a 2003 Volkswagen with a 1.8T engine with 141,000 miles. In the last 2 months I replaced the spark plugs and air cleaner. In the last week or so it started idling roughly on start up. This would last approximately 15 to 30 seconds then seem to stop. It did seem to be worsening as the rough idle would cause the check engine light to flash. Monday morning (10/26/15) I poured one can of your B-12 into my ¾ full gas tank. Upon starting the engine, it again idled very roughly, the check engine light flashed then it went away after a short time. I drove to work as normal that day. My trip to work is approximately 22 miles roundtrip, mostly highway (speeds of 45-65). Tuesday morning I started the car and the rough idle was gone!
    I realize that critics could say that this proves nothing. I don’t know what the problem is/was. Since I don’t know what the problem is/was, I have no way of knowing if it’s fixed. The problem may return. The problem may have been electrical or mechanical, having nothing to do with the fuel system. The problem may have been excess water or “bad gas” and any cleaner might have fixed it. There is no way of knowing if the problem would have self-corrected without the addition of any product.
    I believe that your product did fix the problem. What I like about your ChemTool is I can purchase it for just over $3 at WalMart. Some cleaners cost 4 times that much.


    I have a 1999 Dodge Status with 184K miles on it. I was considering replacing all of my fuel injectors as I had at least two of them barely working and I had rough idling and poor gas mileage (~10 MPG). I witnessed the HEST test and I decided to try the B-12 Chemtool ($4.99 at my local parts store). I put a can of it in my empty tank and then filled to a 1/2 tank with premium. Holy Cow!!! My injectors are all firing 🙂 Yay!


    I was looking for a fuel injector cleaner to treat a rough idle on my 2010 GMC Sierra. There was 30 products to choose from at my auto parts store. I decided to get Berryman’s because it was the only one in a metal can. I figured if it needs a metal can to contain it, it must be strong. I bought 2 cans. The first can straightened out the problem. I recommend to everyone and everyone has called me back to say thank you. I had a neighbor who did not drain his gas in his lawnmower for the winter. In the spring, he started it up and it was surging and would not rev up. I put about 2 ounces in the tank and told him to just let it idle for a while. Within a half hour, it stopped surging and ran like a champ. I now treat my lawnmowers with it. At the end of the season I put 2 ounces in the tanks and let them run until they run out of fuel. In the spring they start with one pull. I just noticed that my truck was getting 18mpg on a route that I take twice a week. I just put a can in and ran the route and got 19.5. With an increase of a 1 and a half mpg, X 100 miles, the stuff pays for itself. I now use it to clean throttle plates with a toothbrush. I love this stuff.

    Danel Cianci

    Hello. Been using your product with Marvel Mystery Oil and with full synthetic oils and also in the gas tank and went 230,000 miles on the 2000 Ford Escort and really great engine performances characteristics and gas mileage.Now using in my brand new 2014 Ford Fiesta in oil and the gas tank along with the Marvel Mystery oil and Motor Coat in oil and gas mileage going to Florida and Texas for the winter as Chicago is very cold and gas mileage us 57 miles per gallon with all my clothes and heavy 2 down blankets and 2 heavy sleeping bags and everything in trunk and the whole car all my stuff.


    1999 Infinity Q45 with 170,000 miles, started to hesitate and lag bit. The car part store employee pushed Lucas and Sea Foam, so I researched online to compare results and found B-12 Chemtool.
    This products works and is less expensive, great value!


    Several years ago while working at a gas station a guy came in with his car smoking and limping along. Glen, the owner, told him that it needed a valve job and would cost a couple hundred bucks. The guy said something like, “OK, I don’t care, just fix it”.

    The guy left and Glen, the station owner, parked it at the far corner of the station lot and poured in two cans of Berryman’s Chemtool into the oil and another can into the gas tank. He let that car sit out there idling for about three or four hours. It smoked like a burning tire for quite some time. He shut it off, changed the oil and filter and I took it for a test drive …. ran smooth as silk.
    He then steam cleaned the engine, painted the heads and valve covers and charged the guy for the valve job.


    Absolutely the best fuel additive ever! Vehicle was having all sorts of problems lagging, choking up, dying at idle, etc. Used one can of this in 3/4 of a tank of fuel, got on the highway, drove 30 miles out and 30 miles back at 60-70 MPH and by the time we got home the engine was purring like a kitten. Thank you Berryman’s!