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Royal Purple Max Boost Octane Booster - 16 oz.

4.6 4.6 out of 5 stars 1,124 ratings
Price:
$14.26
$13.55
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Purchase options and add-ons

  • replaces lead additives for protection of non-hardened valve seats
  • raises octane rating up to 30 points or 3 numbers
  • restores power and fuel economy while cleaning deposits from fuel injectors
  • reduces power loss due to knock-retard in computer-controlled vehicles
  • reduces engine knocking/pinging and stabilizes fuel
  • max-boost is a racing formula and is not street legal.
  • Fit type: Vehicle Specific
› See more product details

Frequently bought together

Royal Purple Max Boost Octane Booster - 16 oz.
$14.26
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+
Royal Purple 18000 Max Atomizer Fuel Injector Cleaner, 6 fl. oz.
$8.32 ($1.39/Fl Oz)
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+
Royal Purple 11722-2PK Max-Clean Fuel System Cleaner and Stabilizer - 20 oz. Bottle, (Pack of 2)
$31.05 ($0.78/Fl Oz)
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CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Top Brand: Royal Purple

Highly Rated
50K+ customers rate items from this brand highly
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Product Description

Royal Purple Max-Boost - 16 fl oz Can is a high-performance octane booster with fuel treatment that increases gasoline octane, reduces emissions, and enhances engine performance while stabilizing fuel. Max-Boost is formulated with MMT, which delivers the best octane enhancement to help eliminate engine-damaging detonation, pre-ignition, and pinging or knocking from low octane gasoline. Max-Boost is formulated for engines equipped with carburetors, port fuel injection and direct injection, as well as turbocharged, supercharged and nitrous-injected engines. Safe for use in leaded and unleaded gasoline's, and alternate fuels like gasohol, reformulated gasoline, and all ethanol blends. Max-Boost is safe for oxygen sensors and catalytic converters. Performance engine oils contain higher levels of phosphorus as an anti-wear additive, which can accumulate in catalytic converters and reduce their effectiveness. Max-Boost protects against phosphorus poisoning of catalytic converters.

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What's in the box

  • Auto part, Automotive Accessories, Replacement and Performance parts

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    Price$14.26$20.98$11.42$12.97$51.12$32.99
    Delivery
    Get it as soon as Saturday, May 4
    Get it as soon as Saturday, May 4
    —
    Get it as soon as Saturday, May 4
    Get it as soon as Monday, May 6
    Get it as soon as Saturday, May 4
    Customer Ratings
    4.64.6 out of 5 stars1,124
    4.74.7 out of 5 stars14
    4.04.0 out of 5 stars17
    4.64.6 out of 5 stars2,337
    4.64.6 out of 5 stars1,014
    4.64.6 out of 5 stars1,179
    Easy to use
    4.8
    —
    —
    4.7
    4.8
    4.7
    Value for money
    4.1
    —
    —
    4.4
    4.1
    4.2
    Mileage
    4.0
    —
    —
    4.3
    4.2
    4.2
    Sold By
    Amazon.com
    Amazon.com
    Engines Stores ✅✅
    Amazon.com
    G.P.S.
    Specialty Products Intl

    Looking for specific info?

    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    1,124 global ratings

    Customers say

    Customers like the performance, value, quality and gas mileage of the auto accessory. They mention that it makes an immediate difference in performance, gives the best performance of any octane booster they've tried, and is worth every penny. Some say that it improves gas mileage by 3 points.

    AI-generated from the text of customer reviews

    53 customers mention45 positive8 negative

    Customers like the performance of the octane booster. They say it makes an immediate difference in performance, and provides the best performance of any otanizer they've tried. They also say the motor is getting better mileage and the boat is running well. Some mention that the product is effective as long as they don't pour the entire bottle per each tankful.

    "...I had to try this product, and it's given me the best performance of any octane booster I've tried, plus I trust it when pouring into my gas tank as..." Read more

    "...To be honest I was skeptical at first but it did give me a noticeable performance boost...." Read more

    "...Definitely an increased throttle response went into it and certainly MPG when just cruising...." Read more

    "...Ever since I added it to My Fuel, I have noticed that I have more Throttle Response and it seems to have eliminated the Lag...." Read more

    34 customers mention34 positive0 negative

    Customers are satisfied with the quality of the auto accessory. They mention that it works well, is flawless, and is the best product for their car. Some say that it cleans out injectors and deposits, and that it lasts longer.

    "...Great product, useless if you don't have an engine that requires it though...." Read more

    "Great stuff! I used this with my 2016 M4 GTS and it is flawless...." Read more

    "...all the vehicles I keep up the maintenance on perform top notch, last longer, save my family a good bit of $$$$$$- I started using their "Max-..." Read more

    "I put this in my truck it cleaned my injection system pretty good...." Read more

    15 customers mention12 positive3 negative

    Customers like the value of the auto accessory. They mention that it's worth every penny, it gives great pickup and gas mileage, and it'll save fuel.

    "...near 100- long story short, from -40 to +100 this octane booster is the very best (I use no ethanol fuel) 91 octane fuel and R.P. keeps my outfit..." Read more

    "...version and have no complaints whatsoever - particularly with the great price, I have to say that I really like how RP feels and how quickly the..." Read more

    "I like the price and the performance" Read more

    "Works ok but not better then other cheaper brands" Read more

    14 customers mention14 positive0 negative

    Customers are satisfied with the gas mileage of the auto accessory. They mention that it gives about a 3 point octane boost, is an excellent otanizer, and adds 2 additional miles per gallon. Some say that it provides added power and stability.

    "Seems to help with gas mileage and performance." Read more

    "...driving in Sport+ now as it's much more responsive and my mileage has improved noticeably. I will be getting a case of this now." Read more

    "...It's definitely improved my gas mileage also." Read more

    "Hi,this is an excellent product enhancing mileage distance and smooth running of the engine...." Read more

    Growl
    5 Stars
    Growl
    Works great in my 14 raptor 6.2, she loves it!
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    Top reviews from the United States

    Translate all reviews to English
    Rich Maybach
    5.0 out of 5 stars Excellent octane booster. Huge difference in Mercury Marauder with 93 Octane tune.
    Reviewed in the United States on May 11, 2017
    Item Package Quantity: 1Verified Purchase
    This is my favorite octane booster product out there. I have a 2003 Mercury Marauder, all stock except for a 93 octane tune. The Marauder has a naturally aspirated engine and requires 91 octane from the factory, but the car had a 93 octane tune when I purchased it in NY. Unfortunately as you get further west, I came to realize the hard way, the premium gasoline becomes 91 octane rather than 93... My car will run on 91 octane, it just doesn't have the same acceleration or "get up and go" feeling that it does with 93. This effectively raises the octane to 94, as it raises it 3 points. So a bottle of this with a tank full of 91, and I'm running 94 octane. I use only Royal Purple HPS oil and filters, so naturally I had to try this product, and it's given me the best performance of any octane booster I've tried, plus I trust it when pouring into my gas tank as it is a trusted brand. Great product, useless if you don't have an engine that requires it though. I always laugh when I see people put 91 or 93 octane into a regular car because it's called "premium".
    25 people found this helpful
    Helpful
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    SeattleKing
    5.0 out of 5 stars Made my M4 GTS more powerful
    Reviewed in the United States on July 15, 2019
    Item Package Quantity: 1Verified Purchase
    Great stuff! I used this with my 2016 M4 GTS and it is flawless. I put this in when my gas was running low and then I filled up my tank so everything can mix in. To be honest I was skeptical at first but it did give me a noticeable performance boost. A bit of background, I was staying in California during the time of testing and the only available gas there is 91 octane instead of the recommended 93 needed for my car. Yes it is not that big of a difference you may think, but my tests show otherwise. I will dyno the car later on to prove my word. The car sounds much more aggressive and burbles more, the engine just sounds much happier when this in the tank. I also tried it with my 2013 Honda Accord in which it didn’t have a noticeable difference. As for MPG, it does not make any difference whatsoever, at least for my cars. I’d highly recommend this for cars which have higher compression ratios that can benefit from high octane. 10/10 in my book, I use this every fill up, got one in my trunk at all times.
    23 people found this helpful
    Helpful
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    Mr Anderson
    5.0 out of 5 stars Floorboard tune up!!!
    Reviewed in the United States on July 24, 2023
    Item Package Quantity: 1Verified Purchase
    Our high compression k and j series Honda engines love this stuff!!! Definitely an increased throttle response went into it and certainly MPG when just cruising. We've got royal purple products in all our engines and gear boxes and now the gas tank.
    Helpful
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    Andrew Murray
    4.0 out of 5 stars Great Boost
    Reviewed in the United States on June 4, 2023
    Item Package Quantity: 1Verified Purchase
    This is some Awesome Octane Booster and seems to work the way it is intended to do so. Ever since I added it to My Fuel, I have noticed that I have more Throttle Response and it seems to have eliminated the Lag. I would use this product again and even plan on using it in the Street Bike
    One person found this helpful
    Helpful
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    Rainer Steinbauer
    5.0 out of 5 stars Great Product
    Reviewed in the United States on February 13, 2024
    Item Package Quantity: 1Verified Purchase
    After only 60 miles I could tell a difference! No idea yet how it effects the mileage, we'll see.
    Helpful
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    Daniel Smith
    5.0 out of 5 stars The Very Best in Octane Boosters
    Reviewed in the United States on August 24, 2014
    Item Package Quantity: 1Verified Purchase
    I have used Royal Purple products for many years, the formulation of all their products, from break-in oil to heavy duty gear lube has helped all the vehicles I keep up the maintenance on perform top notch, last longer, save my family a good bit of $$$$$$- I started using their "Max-Boost Octane Booster" when I had a brand new GMC 7.4 Lt. (454 ci.) crate engine installed in my 1994 K-2500, after using the break-in oil 3 changes in 5,000 miles, I had ordered 9.5 to 1 compression pistons for my new engine and knew I would need high octane fuel to allow the beast to run at it's best. With a 4:10 gear ratio I was not expecting more than 10-12 mpg.- after 21,000 miles (using R.P. fuel system treatment & Max-Boost) I get 14-15.5 on the Hwy. (if I keep it under 70 Mph) With a manual 5 speed (NV4500) even at 75-80 Mph. I get 12.5-13 Mpg. I'm a bit excessive when it comes to my truck, as I'm disabled and 84 miles from the Dr. office and 75 miles from the nearest Wal-Mart- N.E. Wyoming winters can be brutal, summer can see temps. near 100- long story short, from -40 to +100 this octane booster is the very best (I use no ethanol fuel) 91 octane fuel and R.P. keeps my outfit purring like a tiger- Thanks Amazon and much thanks Royal Purple for all the fluids in my GMC and my 77 yr. young mother's 2005 Toyota Tundra
    10 people found this helpful
    Helpful
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    Bobby
    5.0 out of 5 stars Works Great
    Reviewed in the United States on June 27, 2023
    Item Package Quantity: 1Verified Purchase
    I put this in my truck it cleaned my injection system pretty good. At least my truck ran better after putting it in my gas tank, so I bought it three more times.
    One person found this helpful
    Helpful
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    Top reviews from other countries

    Translate all reviews to English
    Amazon Customer
    5.0 out of 5 stars Royal Purple...there are no Substitutes
    Reviewed in Canada on May 31, 2023
    Item Package Quantity: 1Verified Purchase
    Use every 2000 miles and car injection system
    Cleaned and runs better.
    Pour into a half tank of Gas. Drive for a day
    Then fill up. You will notice the difference.
    Great product and non harmful to the engine.
    Report
    Stefano N.
    5.0 out of 5 stars Ottimo Prodotto
    Reviewed in Italy on May 30, 2023
    Item Package Quantity: 1Verified Purchase
    Abituato a additivi vari devo dire che questo fa la differenza netta. Nel senso che questo davvero aumenta di 3 unità gli ottani della benzina.
    Usato nella mia Mini Cooper S. Va molto bene.
    4 people found this helpful
     Report
    Luis L.
    5.0 out of 5 stars buena marca
    Reviewed in Mexico on January 12, 2021
    Item Package Quantity: 1Verified Purchase
    buen producto recomendado y a buen precio.
    Report
    Amazon Customer
    5.0 out of 5 stars GIVE YOUR CAR A BOOST
    Reviewed in the United Kingdom on December 20, 2022
    Item Package Quantity: 1Verified Purchase
    Does exactly what it says, gives an octane boost to your cars performance
    Report
    Client d'Amazon
    4.0 out of 5 stars Aucun détérioration pour l'injection électronique du véhicule.
    Reviewed in France on January 27, 2019
    Item Package Quantity: 1Verified Purchase
    Bonjour,
    Excellent additif octane booster,mais à ne pas mettre dans le réservoir d'une petite cylindrée.La voiture est plus réactive dans les premiers rapports et sur autoroute.
    Report