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Royal Purple

Royal Purple 11722-2PK Max-Clean Fuel System Cleaner and Stabilizer - 20 oz. Bottle, (Pack of 2)

  • Based on 938 reviews
Condition: New
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$33.97 Why this price?
Save $3.02 was $36.99

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As low as $8 / mo
  • – 4-month term
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Availability: In Stock.
Fulfilled by R/A Hoerr Incorporated
Arrives Thursday, Sep 17
Order within 9 hours and 5 minutes
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Features

  • 3-in-1 fuel additive keeps new engines clean and improves vehicle's performance
  • Improves fuel economy an average of 3.2 percent
  • Increases horsepower an average of 2.6 percent
  • Reduces hydrocarbon, NOx and CO emissions (on average 12, 13 and 18-percent respectively)
  • Prevents rough idle, hesitation and stalling

Description

Max-Clean is a state-of-the-art high performance synthetic fuel system cleaner that maximizes the performance of your fuel system. Max-Clean restores fuel economy and deeply penetrates and cleans injectors, carburetors, intake valves and combustion chambers.

Brand: Royal Purple


Item Form: Liquid


Scent: Unscented


Specific Uses For Product: Engine cleaner


Material Feature: Liquid


Item Form: Liquid


Scent: Unscented


Specific Uses For Product: Engine cleaner


Brand Name: Royal Purple


Manufacturer: Royal Purple


Model Number: 11722


Part Number: ROY11722-2PK


Item Volume: 15 liters


Unit Count: 40 Fluid Ounces


Number of Items: 1


Item Weight: 1.8 pounds


Size: 40 Fl Oz (Pack of 1)


Material Features: Liquid


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Sep 17

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Works great
Good stuff
Reviewed in the United States on April 22, 2026 by rg
    • Rejuvenated my 7.3 Diesel
I have a 2002 Ford F250 with a 7.3L diesel. Truck has 140,000 miles on it. I noticed that my mileage was starting to get worse and I had a tapping sound coming from an injector. A friend of mine suggested this product. I added two bottles to a full tank of fuel and ran it. Like night and day difference. Smoother throttle response, more power, better driveability, and the injector tapping sound is gone. I can't believe how well this worked. Am sure my mileage is up as the truck is driving so much better. Went ahead and put this product on subscribe and save and will use this as regular maintenance on both my 7.3 and my 6.7. Worth every penny. ... show more
Reviewed in the United States on October 17, 2023 by Scott The Wolf Tamer
    • WOW highly recommend
My 2006 Pontiac G6 with 180000 was not idling very well and started poorly. I added this product along with replacing my sparkplugs (which only had 30000 on them) and it did not take long for me to notice that the poor idling and poor starting issues went away. I went from 25.8 mpg to 27.3 mpg and get this, most of my driving is of the short trip into town variety. I mean WOW what a difference. I'll take it and highly recommend using this product. ... show more
Reviewed in the United States on June 22, 2024 by Brandon England
    • Good price
Good price
Reviewed in the United States on July 7, 2025 by Anon
    • Recommended
Good quality
Reviewed in the United States on January 15, 2026 by Jim Tadlock
    • Worked extremely well
If you are unsure of this product, look up Scotty Kilmer on yoootube....he recommends it. And he is very honest and debunks many products, but not this one. I had problems with hard acceleration. Hesitatation, turbo was ineffective...it was misfiring, and I felt it could be major or minor but it was going to cost $ to fix. 1 can, 30 minutes later, turbo is smooth, acceleration strong, up to redline, power is back. Dirty, clogged injectors were the issue. ... show more
Reviewed in the United States on September 9, 2022 by Lisa Flores
    • Works well
Clears up any pinging from cheap gas as my wife and I both need to run 91 or higher ,well in CA 91 is the highest (I am from NC where there they had 107 on pump gas) She has a Mazda CX7 Turbo ,and I have a Civic si the body style just before 2016. We love our cars and only use top products . So this will quiet down a noisy engine if you always running 87 or even 89 the lower the # or grade of gas the faster it burns , leaving behind more carbon as it does not have the time or heat necessary to burn off the carbon which leads to clogged injectors , throttle body's full of black carbon , and worse can lead to fuel filter failure or even your fuel pump so spend a little more on Chevron W/ Techron as that has cleaners in it an run 91 octane or monthly add Lucas injector cleaner , Sea foam or royal purple ... show more
Reviewed in the United States on December 2, 2018 by Kimberly
    • Best on the market
Best products for any vehicle youll tell a difference almost instantly I use it a lot it just a little cheaper online but I use all their products on my vehicles and the oil is great too
Reviewed in the United States on June 27, 2025 by allen witcher

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