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Klotz Higher Octane Booster Fuel Treatment Power Booster and Cleaner for Gasoline – 1 Gallon KL-628

4.5 4.5 out of 5 stars 370 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Octane Boosters by Klotz
$61.52
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  • All items sold individually unless otherwise specified
  • Stabilizes flame front and controls burn speed
  • Tetraethyl lead substitute for added lubricity
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Product Description

Klotz Octane Booster is a top-treat fuel additive that increases the octane of the base fuel. The elevated octane level improves throttle response, mitigates early detonation, and stabilizes the flame front within the combustion chamber (especially when used in high-compression engines). The formulation also contains chemistry to improve lubricity, cleanliness, and storage stability. This additive is compatible with gasoline or ethanol blends. It is safe for oxygen sensors and catalytic converters, and it does not contain methyl tertiary-butyl ether (MTBE). Boosting Octane – One ounce of Octane Booster per one gallon of gasoline will raise the octane by over two numbers. Two ounces per one gallon of fuel will raise the octane by five numbers. Three ounces per one gallon of fuel will raise the octane by over seven numbers. Four ounces per one gallon of fuel will raise the octane by ten numbers. Octane Booster works in inverse ratios and the quality of the base fuel. Gasoline Stabilization – One ounce of Octane Booster per one gallon of gasoline will provide six to eight months of stabilization. Two ounces of Octane Booster per one gallon of gasoline will provide twelve to sixteen months of stabilization. Fuel System Cleaner – Sixteen ounces of Octane Booster will treat up to twenty gallons of gasoline. For Off-Road use only. Klotz is Proud to be Made in the USA.

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Klotz Higher Octane Booster Fuel Treatment Power Booster and Cleaner for Gasoline – 1 Gallon KL-628

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What's in the box

  • Klotz 842-0134

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    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    370 global ratings

    Customers say

    Customers like the performance, power, and value of the octane booster. They mention that it works well, has a feel of more power, is good value, and the best increase in number for the money. Customers are also satisfied with quality, stability, and pinging. However, some customers report that the product takes off paint and discolors it. Opinions are mixed on the smell.

    AI-generated from the text of customer reviews

    36 customers mention29 positive7 negative

    Customers like the performance of the octane booster. For example, they say it works as well as Torco, improves engine performance, and has no fuel or performance issues. That said, some say it's perfect for racing and puts out more power.

    "...Anyway I mix the Klotz 1 ounce to a gallon and it works perfectly...." Read more

    "...Been using Lucas Octane Booster and it works great. I was just a little worried with the rust orange film the MMT leaves behind...." Read more

    "This stuff works great. All my vehicles seem to get better mileage and run smoother. However it is highly caustic...." Read more

    "I use this with all my outdoor equipment. Have had no fuel or performance issues...." Read more

    34 customers mention34 positive0 negative

    Customers are satisfied with the quality of the octane booster. They mention that it is the best otanizer they can buy, it is great for increasing oCtanine without paying the price for premium gas, and it makes their classic car enjoyable again. They also say it is a great additive for pump gas and makes their bike purr.

    "...the E10 gas, I don’t think anything can but it has made driving my classic car enjoyable again and that’s enough." Read more

    "...I've been running my car hard for two years now and have had zero failures. No ping and no dieseling when I shut it off...." Read more

    "Good stuff. Anything klottz makes is awesome." Read more

    "Great for increasing octane without paying the price for premium gas." Read more

    17 customers mention13 positive4 negative

    Customers like the value of the powersports vehicle part. For example, they mention it's cheaper than buying from the pump, and provides the best increase in number for the money.

    "after mixing product car was knocking and set engine light, good price but not for the running issue, remember you get what you pay for" Read more

    "...It's also the best deal out there, and safe to use with cats and o2 sensors." Read more

    "Best increase in number for the money. Easy to use. Haven’t used long enough to know how it impacts mileage, if at all...." Read more

    "It is expensive...." Read more

    4 customers mention4 positive0 negative

    Customers say the pinging is solved with the motorcycle air filter.

    "...No ping and no dieseling when I shut it off. Also worth noting, the pump gas I run has 10% ethanol in it...." Read more

    "Truly raises octane rating by 10 points. No pinging." Read more

    "...One has 11:1 compression. This helps with pinging.Same goes for Harley’s." Read more

    "...Gives the exhaust a great smell and seems to have helped with the pinging...." Read more

    4 customers mention4 positive0 negative

    Customers like the stability of the powersports vehicle part. They mention that it stabilizes gas, has an octane boost, and has a fuel stabilizer in it.

    "...engines, not so much for the octane boost but for the chemical stability it gives gas." Read more

    "...Lowered my head temperature, lubricates the combustion chamber, and stabilizes gas. I add 12oz to 5 gallons of 89 pump gas...." Read more

    "...This really helps stabilize gas. When I do drive them they crank & run so much better. One has 11:1 compression. This helps with pinging...." Read more

    "...Has fuel stabilizer in it as well." Read more

    3 customers mention3 positive0 negative

    Customers are satisfied with the power of the powersports vehicle part. They mention that it has a feel of more power, the engine sound is nicer, and the car growls.

    "...Has a feel of more power. Added 1 oz per gallon so 20oz. The engine sound is nicer. If you punch it... You will go...." Read more

    "...Oh baby. This stuff is great. The car growls and you can feel the power difference. I have a supercharged gt500 and it loves it...." Read more

    "This is good stuff people!! You can feel the power come alive. One ounce per gallon is whole number increases, not .# increases...." Read more

    11 customers mention5 positive6 negative

    Customers are mixed about the smell of the powersports vehicle part. Some mention it has a nice smell, while others say it leaves a big stain that will never come out.

    "...Many others commented on the smell. It does smell unique and sort of good in a way...." Read more

    "...Guess I'll continue to use Lucas, even though it leaves the MMT rust orange film...." Read more

    "Great product, nice smell, have been using Klotz products since the early 1980's." Read more

    "...Works fantastic and smells terrible .I would recommend to weare a plastic gloves always before you use it ." Read more

    4 customers mention0 positive4 negative

    Customers are dissatisfied with the paint removal of the powersports vehicle part. They say it's messy, screws up paint, and discolors it in seconds.

    "...Always use a good funnel and have a rag ready. It almost instantly screws up paint--much, much faster than anything like brake fluid will...." Read more

    "...Cost wise ACES IV hands down. Used this for years. Yes messy and takes off paint. ACES did boost MPG Klotz didn't." Read more

    "This octane boost absolutely ruined the paint on my new car (2017). I only had a few drops it went all the way thru my clearcoat in the paint...." Read more

    "Will eat your paint in seconds!..." Read more

    Will eat your paint in seconds!
    4 Stars
    Will eat your paint in seconds!
    I can notice a bit more power when I add 16-32 oz to a full tank of 93 octane gas. I use this to make sure I’m really getting 93 octane (or higher) for my blown BBC. People know just by the smell that you are using this.WARNING!! They are not kidding about not getting this on paint!!BEWARE!! It will eat right through your clear coat or paint almost instantly! You won’t even have time to wipe it off.Even one tiny drop or splash while trying to pour this stuff in will eat your finish.Use a heavy towel around the entire area when you are pouring this into your gas tank. Only reason I’m not giving it five stars.But performance wise...it does work.
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    Top reviews from the United States

    Thomas L. Richter
    5.0 out of 5 stars Just what my car has been asking for
    Reviewed in the United States on February 3, 2019
    Verified Purchase
    I’d heard from a very respectful publication about this product, that it’s one of the few products that really boost the octane. I live in a state where the gas (methanol blend) is unbearable to a carbureted engine. I’ve purchased 100 octane fuel and have tried multiple high octane gas stations, 91 octane is what most gas stations have. I’ve read that the additional octane in higher octane fuel is often achieved by adding, what, you guessed it, more of the additives, not more gas. The gas here just seems to burn with my classic car like it has a lot of empty calories. It also starts to boil very easily, once heat soak hits the engine bay it’s over with. I’d heard from people that using a lower octane fuel won’t have as much additives that they add to today’s gasoline such as butane. I tried using the 87 octane alone in my classic car and detonation occurs after the engine has been running at operating temperature for a while (gas starts to boil aggressively at very low temperatures). I’d also read that Klotz also helps counter the above mentioned side effects of today’s E10-E15 gasoline. Klotz seemed like the perfect solution. So I decided to fill the tank at 2 ounces per gallon with Klotz and 87 octane fuel as suggested 16 ounces when I’ve got the tank 1/2 full, and then the last 6 ounces to top off my 11 gallon tank. I really expected no change, another one of those hopeless experiments I thought. I could tell when the last of the higher octane pump gas had consumed itself out of the carburetor float bowl and the new mixture started coming in, I noticed a definite, significant difference in the combustion, it reacted to the throttle much better, it felt like a longer burn time, like what my engine has been asking for, like gas is supposed to feel like! It also quieted down the engine (as well as electric fuel pump) as a bonus. My next thought was I wish I had a 30 gallon drum of this stuff! I just have to be careful putting it in my tank because it will eat the paint if spilled (I just use a funnel) It doesn’t cut everything out from the side effects of the E10 gas, I don’t think anything can but it has made driving my classic car enjoyable again and that’s enough.
    13 people found this helpful
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    Gary Nakamura
    5.0 out of 5 stars Octane Booster really works great on my classic car.
    Reviewed in the United States on April 27, 2024
    Verified Purchase
    Truly raises octane rating by 10 points. No pinging.
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    Amazon Customer
    5.0 out of 5 stars That means they raise it like. 1 so the 93 octane becomes 93
    Reviewed in the United States on September 18, 2016
    Verified Purchase
    I have a 440 Mopar big block in my Plymouth Duster. It has 11.5 to 1 compression and 210 psi cranking pressure. When I first got it running I ran 93 octane pump gas. I heard a little bit of ping when I rolled into the throttle and it dieseled a few times when I shut it off. I tried Turbo 108 octane booster from the auto parts store and the only way I could get it to stop the ping was to mix it at high concentrations and it was not cheap. I did some research online and discovered that the Turbo 108 and other brands the parts stores sell only raise the octane by points of a number. That means they raise it like .1 so the 93 octane becomes 93.1 unless you dump a lot of it into the tank. The Klotz and other premium boosters raise it by whole numbers. Anyway I mix the Klotz 1 ounce to a gallon and it works perfectly. At $52 a gallon, each ounce of the Klotz is only about 41 cents so it only adds 41 cents to a gallon of fuel. I've been running my car hard for two years now and have had zero failures. No ping and no dieseling when I shut it off. Also worth noting, the pump gas I run has 10% ethanol in it. I have had no alcohol related problems with the fuel system and I store it all winter without draining the fuel. I frequently remove the fuel bowls for jet changes and the carb is spotless inside. I highly recommend the Klotz octane booster.
    72 people found this helpful
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    SUBDSGNR
    4.0 out of 5 stars Nasty, nasty stuff...but works
    Reviewed in the United States on June 16, 2017
    Verified Purchase
    This stuff is VERY powerful. I cannot emphasize this enough. It tends to have low surface tension, so it tends to creep a little and drip when you pour it. Always use a good funnel and have a rag ready. It almost instantly screws up paint--much, much faster than anything like brake fluid will.

    Many others commented on the smell. It does smell unique and sort of good in a way.

    So as far as performance, it absolutely does SOMETHING, even on naturally aspirated motors. Revs tend to be smoother, and my butt feels minor improvement at low RPM cruising. This is where most people spend the most time anyway. I have would be skeptical about seeing peak HP gains with NAs. There does seem to be a shifting of the power curve to the left, though. But I'd be pouring this stuff in a turbo motor all day long.

    Doing the math, it's borderline worth it to buy regular gas and boost it to 93 or more with this. Anything past that on most NAs is a waste.
    6 people found this helpful
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    scott waege
    5.0 out of 5 stars Nice
    Reviewed in the United States on April 13, 2024
    Verified Purchase
    Thanks
    Helpful
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    Bigdaddydeas
    5.0 out of 5 stars I love all Klottz products
    Reviewed in the United States on November 5, 2023
    Verified Purchase
    Good stuff. Anything klottz makes is awesome.
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    Gary Miller
    5.0 out of 5 stars great for high performance engines
    Reviewed in the United States on September 29, 2023
    Verified Purchase
    Great for increasing octane without paying the price for premium gas.
    2 people found this helpful
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    DWL
    1.0 out of 5 stars Does not work please read below
    Reviewed in the United States on April 19, 2024
    Verified Purchase
    I filled my car up as normal and used the correct amount of this product as instructed to boost octane numbers. Drove around awhile and read knock sensor numbers. I’ve had reading all over the board with using this product with regular unleaded. I used premium fuel on next fill up with no octane booster and my knock sensor readings were normal. Bottom line, if you drive a modern car that calls for premium fuel just use premium fuel. Do not attempt to save money by using regular octane pump gas and then using this product to try and save a few dollars. I tried to save money by using regular pump gas and then using this product to boost octane numbers.
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    Top reviews from other countries

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    Yves G
    5.0 out of 5 stars Excellent additif
    Reviewed in Canada on April 13, 2024
    Verified Purchase
    Bon raport qualité, dosage facile.
    Report
    Guy Santarossa
    5.0 out of 5 stars Small engine maintenance.
    Reviewed in Canada on January 6, 2024
    Verified Purchase
    Stops the low octane (87) from gumming up carburetors and fuel injection engines, my boat motor. ATV. Snowmobile..helps easy startups.
    Report
    Broke Grandpa
    5.0 out of 5 stars Works as advertised.
    Reviewed in Canada on October 24, 2022
    Verified Purchase
    I have a small crossover vehicle with a 2 litre engine. But it has 11.5:1 compression ratio. I like the product. Especially when I pull a trailer with my little vehicle, or when I drive it through the mountains. It gets really sluggish on regular fuel when the load goes up. This product solves that problem. Truly noticeable increase in power and throttle response. I have absolutely no issue with the quality of this product but I wouldn't buy Any Octane Booster in a gallon container again. I took about a 3000 mile road trip. I had to bring along a measuring cup and funnel to add Octane Booster in the right proportions. And once used, those had the chemical smell of the Octane Booster that lingered in the vehicle. Also, at least once, the gallon container tipped over, leaking a few drops of Octane booster into my vehicle. That didn't smell very good either. I believe this product and several others like it come in small plastic containers that would be much more convenient to use.
    2 people found this helpful
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    Caster
    5.0 out of 5 stars very good product!
    Reviewed in Canada on November 29, 2023
    Verified Purchase
    Arrived quick and the product is great!
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    Amazon Customer
    4.0 out of 5 stars Klotz
    Reviewed in Canada on October 13, 2022
    Verified Purchase
    Nice🤙🏻
    Report