B-12 0116 Chemtool Fuel Injector Cleaner, 15 Ounce, (Single Unit)

B12 is a great fuel system cleaner. I’ve been using this for years. Better value for the money than Seafoam. Functionality, durability, and speed of use is all good. Would recommend.

This cleaner is a powerhouse in a can. The High Energy Solvent Technology (H.E.S.T.) formula quickly dissolves gum, varnish, and fuel residues from carburetors, injectors, valves, and pistons. I used it in a high-mileage vehicle with a rough idle, and within 100 miles, the engine smoothed out noticeably and regained lost power. It even bumped up my fuel economy by a couple of MPG.It’s safe for catalytic converters and oxygen sensors, and the easy-pour metal can makes it simple to add to your tank. Whether you're treating a car, truck, or even small engines like lawnmowers, this stuff works fast and leaves a lasting difference. For under $5, it’s one of the best bang-for-your-buck fuel system treatments out there.

My daily "beater" is an old 98 Nissan Sentra SE.Quick intro explanation:So far an amazing car as I bought it five years ago on an auto auction for $1500.Back then the car had 188,000 miles on it.I've been driving around for five years and approaching 220,000 miles repair free ever since .I do good maintenance change oil and oil filter at the latest at 3000 miles or at least twice a year.I changed a full flush ATF fluid every 20,000 miles.The 2 L four-cylinder engine amazes me not only with the power it has (you can tell the soul of it comes from Nissan motorsports) but this is the first time have an engine with absolute it does not burn a single drop of oil!Nada. Zilch. Considering the mileage it has that is quite amazing! I once marked on the dipstick the oil level on a morning after the day of an oil change. 3000 miles later in the morning before going for no change I pulled out the dipstick and the oil was exactly on the same marking I made!I also tested compression on this four-cylinder engine and to my other surprise I am pretty much equal on all four cylinders with minute differences 2 to 3 psi! Amazing.It also is the first engine in a car that doesn't tip oil considering that the vehicle is 22 years old and has 220,000 miles on it! Amazing, amazing!The only complaint I have about this car is that I never achieved the city mileage of around 20 miles per gallon.The vehicle is officially listed as 20/27 city/Highway.Mine was always low around the lousy 14 to 15 gallons per mileFreeway going 65 does better and I get close to 22-24 miles per gallon. Not as great as specified.I spoke with a trusted mechanic about this who then mentioned clean out your intake with Berryman B12 and dump a can into the gas tank when you fill 'er up. You'll be surprised he said.I read and watched a few YouTube's about Berryman B12 and decided to give it a try.So I did that.And boy was I surprised!Following instructions I first slowly emptied a whole can into the running engine, with the other hand slightly opening and closing the throttle to avoid choking it off.I emptied gradually an entire can via a small hose by intake suction gradually before the throttle body.The first surprise came thereafter! Now suddenly my idle was about 400 RPM higher running. Instead of 900 now at 1300 RPM!So I readjusted the idle air screw so that the idle RPM was 900 again.Then I started to drive around mostly city driving and noticed that the engine was much more responsive and I could be very light on the gas to move her. Next time I gassed up I added a full can Berryman B12 in the gas tank. I drove around mostly city and some short freeway drives.I noticed the car was "feeling" and driving better and definitely much more responsive.Next time I gassed up I measured my fuel economy and what was in city driving usually around lousy 14-15 miles per gallon was now after the treatment suddenly 20 to 21 gallons per mile!I couldn't believe it!I gassed up since twice and every time results shows a significant increase in miles per gallon, city driving and/or Highway.That is amazing!I can say safely now that after having driven several hundred miles that my average city mileage is around 21-22 miles per gallon and on the highway!The car performs considerably better and stepping full on the accelerator boy does she take off like never before!Berryman B12, Truly awesome stuff that evidently really works and does the job!

I've never really had an issue with clogged fuel injectors but I use this product every couple months just as a safeguard and I do seem to notice a difference in engine power/smoothness after using. My one issue is with the cap assembly; after you open the cap there is a plastic pull-tab. That pull -tab always seems to tear before I can get the bottle opened. I then have to puncture the seal in order to pour it into my gas tank.

Price/convenience. Works good

Great stuff! Solved my rough idling riding mower engine. Also improved the power of the engine. I’m ordering the 12 pack of this product and giving all my gas engines a tuneup.

I love this stuff. I’ve used it multiple times for general carbon clean up, fuel injector clean up, I’ve even used 1oz per l of oil into the oil and driven the car for a few miles to clear stuff up. Works well at flushing sludge out from valves and general cleaning. For the price, definitely worth it.

Smooth my old pickup right out. Four months later still runs great. Will buy again