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Royal Purple Max-Clean Fuel System Cleaner and Stabilizer 11722 20 Ounce

4.6 4.6 out of 5 stars 2,316 ratings

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20 Ounce

Purchase options and add-ons

  • 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)
  • Fit type: Vehicle Specific
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Important information

Legal Disclaimer

CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov


From the manufacturer

Royal Purple Max-Clean Fuel System Cleaner and Stabilizer

Royal Purple’s Max-Clean is a state-of-the-art synthetic fuel system cleaner that deeply penetrates and cleans injectors, carburetors, intake valves and combustion chambers to restore fuel economy and reduce emissions.

NAPA Know How writers recently cited twice-annual use of Max-Clean in gas tanks as one of the “10 Overlooked Services that can Extend the Life of Your Vehicle.”

Highly versatile, Max-Clean is EPA / CARB compliant and safe for use in gasoline and diesel engines including all ethanol blends or biofuel. Max-Clean is great for use in in both 4-cycle and 2-cycle engines, and will not harm specialized emissions equipment.

Fuel system cleaner is worth it. Multiple product fleet tests were conducted on various makes and models of vehicles. Royal Purple found that after as little as one treatment, Max-Clean can provide significant advantages in engine performance and fuel economy.

Performance Advantages

Improve fuel economy an average of 3.2 percent and horsepower an average of 2.6 percent. Reduce hydrocarbon, nitrogen oxide (NOx) and carbon monoxide (CO) emissions (on average 12, 13 and 18 percent respectively). Prevent rough idle, hesitation, stalling and premature spark plug fouling. Inhibit corrosion and oxidation.

Additionally, Max-Cleans helps to reduce deposit-related engine knocking and pinging. It also stabilizes fuel during off-season and storage.

Recommended Treat Rate and Usage

10,000 mile interval - 20 oz. can.

Pour entire contents of 20 oz. can into a nearly empty tank and refuel. One (1) can treats up to 20 gallons. For tank sizes outside of this range, use one (1) ounce per gallon. In 2-cycle engines, use one (1) ounce per two (2) gallons.

Product Benefits

  • Improve fuel economy and restore horsepower
  • Reduce hydrocarbon, nitrogen oxide and carbon monoxide emissions
  • Prevent rough idle, hesitation, and stalling
  • Prevent premature spark plug fouling
  • Reduce deposit-related engine knocking and pinging
  • Stabilize fuel during off-season and storage
  • Superior corrosion and oxidation inhibitor

Fuel injector before Max-Clean

Fuel injector after Max-Clean

Product Description

Royal Purple Max-Clean is a state-of-the-art high performance fuel system cleaner that maximizes the performance of your fuel system. Max-Clean restores fuel economy by deeply penetrating deposits and cleaning injectors, carburetors, intake valves and combustion chambers. Royal Purple Max-Clean is EPA / CARB Compliant. Recommended for use in gasoline and diesel engines and can be used with all ethanol blends or biofuel. Max-Clean can be used in both 4-cycle & 2-cycle engines and will not harm vehicle emissions equipment.

Product information

Technical Details

Additional Information

Warranty & Support

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Product Warranty: For warranty information about this product, please click here

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Royal Purple Max-Clean Fuel System Cleaner and Stabilizer 11722 20 Ounce


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Price-19% $12.97
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$16.49$12.98$4.22-6% $18.27
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Get it as soon as Tuesday, Apr 2
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Customer Ratings
Easy to use
4.7
4.8
4.7
4.6
4.7
Value for money
4.4
4.6
4.7
4.3
4.4
Mileage
4.3
4.5
4.6
4.2
4.4
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Customer reviews

4.6 out of 5 stars
4.6 out of 5
2,316 global ratings

Customers say

Customers like the performance, acceleration, and cleaning of the auto accessory. They mention that it improves performance, makes the engine more responsive, and provides a really good system cleaning. Customers also like the noise, and ease of use. However, some customers differ on value and power.

AI-generated from the text of customer reviews

274 customers mention247 positive27 negative

Customers are satisfied with the performance of the engine cleaner. They mention that it improves performance, makes their car run better, and improves fuel mileage. Some say that the product keeps things running properly for 3-4 tanks. Overall, most are happy with the product's performance and recommend it to others.

"...I appreciate that Max-Clean is suitable for use in both gasoline and diesel engines, making it a versatile choice for a wide range of vehicles...." Read more

"Product improved performance on my v-6" Read more

"Well, i was skeptical, but the treatment works well !..." Read more

"...The car runs better then it ever has while I had it! I really didn't think one bottle could make such a big difference...." Read more

113 customers mention104 positive9 negative

Customers are satisfied with the acceleration of the auto accessory. They mention that it improves fuel efficiency, smoother engine performance, and long-term fuel system. They also say that the car drives smoothly now, and the engine is more responsive. Customers also say the throttle response is better, and their 4x4 diesel runs smoother.

"...Improved fuel efficiency, smoother engine performance, and long-term fuel system protection make Royal Purple Max-Clean Fuel System Cleaner and..." Read more

"Really did a great job cleaning fuel system. Car runs much smoother" Read more

"...measure any actual increase in fuel mileage but, my engine seems to run somewhat smoother with perhaps a "slight" increase in power!" Read more

"...No change in the Mileage but engine seems running smooth. I only received can without yellow pipe extension...." Read more

58 customers mention58 positive0 negative

Customers like the cleaning of the product. They mention it gives a really good system cleaning, helps clean the fuel lines and system, and stabilizes the gas. Some say it improves MPG and the oil stays cleaner. They also recommend it to help clean out older motors and say it's the best fuel injector cleaner available.

"...Additionally, Max-Clean acts as a stabilizer, which is particularly valuable if you have a vehicle that sits idle for extended periods or if you..." Read more

"Really did a great job cleaning fuel system. Car runs much smoother" Read more

"...in the white can and I get great results with them, helps keep the fuel system clean" Read more

"...This cleans so well that if you don’t maintain your car (or van) it could even dislodge carbon buildup in the intake runners or injectors...." Read more

23 customers mention19 positive4 negative

Customers like the quality of the auto accessory. They say it improves mileage, oickup, and fuel economy. Some say it gets rid of rough idle and improves performance. Overall, customers are satisfied with the quality and performance of the product.

"...I think it makes a difference, along with a good quality gasoline (top tier)." Read more

"...make as much noise, the responsiveness of the engine to the gas pedal is much improved and we even picked up 3 mpg from what it normally gets........." Read more

"...felt - Smooth idle, quick start (in freezing cold in MN) and improved peppiness when stepping on the gas...." Read more

"...It makes a noticeable difference almost instantly and continues to work to clean your entire fuel system all the way until your next tank of gas,..." Read more

17 customers mention14 positive3 negative

Customers like the noise of the auto accessory. They say that it makes their engine quieter, and the car has more oomph when accelerating. They also say that the fuel injectors don't make as much noise, and that it cleans up the idle noise. Overall, customers are satisfied with the performance and sound of their car.

"...vehicle's acceleration became smoother, and there was a noticeable reduction in engine noise...." Read more

"...sometimes.....After one of these cans in the tank, the injectors don't make as much noise, the responsiveness of the engine to the gas pedal is..." Read more

"...I have since noticed that when stopped at a light my engine is almost entirely silent. It's almost a little eerie!..." Read more

"...I noticed the difference after the very first use. My engine sounded happy and my car had more ooomph when accelerating, and for a car with over 174..." Read more

14 customers mention14 positive0 negative

Customers find the auto accessory easy to use. They mention it has easy-to-follow instructions, and it eliminates hesitation while idle. Customers also say it's easy to dispense and fast acting.

"...First and foremost, this product is easy to use. The 20-ounce bottle is convenient and provides enough treatment for several applications...." Read more

"...I use this every 10,000 miles. It's easy to use pop the seal, apply the nozzle and put in your gas tank. It's worth the buy...." Read more

"...vibration at idle is gone and acceleration is smoother with no feeling of hesitation...." Read more

"Ease of use and better engine response was soon noticable." Read more

63 customers mention41 positive22 negative

Customers are mixed about the value of the auto accessory. Some mention that the price is well worth it, and it's a cheap peace-of-mind additive. However, others say that it'll help clean your fuel lines and fuel system, but it'd be better off with a cheaper product.

"...Other than that, it's a great product and definitely worth the investment. I'm not going to say you will see a huge improvement, but it does help...." Read more

"...but it helps and if it helps out an aging fuel pump it is well worth the money. I will be buying more." Read more

"...While it's not the cheapest fuel system cleaner on the market, the results it delivers are worth the investment...." Read more

"...more of these cuz this was hands down the best option and it's not even expensive!" Read more

9 customers mention6 positive3 negative

Customers are mixed about the power of the auto accessory. Some mention that it restored power in a turbo-charged Kia Optima, while others say that it caused their car to lose power and misfire.

"...1 bottle code is gone and has not come back...." Read more

"My car was having some misfiring problems at idle which I thought was unusual and was not throwing a check engine light...." Read more

"I gotta say I love the product, power restore, engine more responsive. The only con is: Such a stupid bottle design...." Read more

"...It did not, on short trips or long. No noticeable change in power or throttle response either...." Read more

Works well!
5 Stars
Works well!
Posting about a 1mpg overall increase in same driving the last 3 tanks. Driving a 2011 5.7l HEMI Jeep Grand Cherokee. Was at 15.3 on average and about 22.5 on the highway. Now at 16.4 on average and about 25 on the highway at 70 on level interstates.
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Top reviews from other countries

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Danny Pella
5.0 out of 5 stars Royal purple cleaner
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Alejandro
5.0 out of 5 stars Buen producto
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Eduardo Sandoval
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