Royal Purple Max-Clean Fuel System Cleaner & Stabilizer, 20 Fl. Oz.
Royal Purple Max-Clean Fuel System Cleaner & Stabilizer, 20 Fl. Oz.
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Royal Purple Max-Clean Fuel System Cleaner & Stabilizer, 20 Fl. Oz.

Royal Purple Max-Clean Fuel System Cleaner & Stabilizer, 20 Fl. Oz.Royal Purple Max Clean Fuel System Cleaner Stabilizer 20 oz6 pack Royal Purple Max Clean Fuel System Cleaner Stabilizer 20 oz2 pack Royal Purple Max Clean Fuel System Cleaner Stabilizer 20 oz24 pack Royal Purple Max Clean Fuel System Cleaner Stabilizer 20 oz12 pack Royal Purple Max Clean Fuel System Cleaner Stabilizer 20 oz
Pack Size:Single

Key item features

  • System Cleaning: This 20 fl. oz. fuel system cleaner and additive deeply penetrates deposits to clean injectors, carburetors, intake valves, and combustion chambers.
  • Performance Restoration: It restores fuel economy by an average of 3.2% and horsepower by an average of 2.6%, maximizing vehicle performance.
  • Emission Reduction: The cleaner reduces hydrocarbon, NOx, and CO emissions by an average of 12%, 13%, and 18% respectively.
  • Engine Protection: It prevents rough idle, hesitation, stalling, premature spark plug fouling, and reduces deposit-related engine knocking and pinging.
  • Fuel Stabilization: Max-Clean stabilizes fuel during low-use and storage periods, effectively preventing fuel varnishing.
  • Broad Compatibility: Suitable for use in 4-cycle and 2-cycle engines, it is compatible with gasoline, diesel, ethanol, and biofuel engines without harming emissions equipment.
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Current price is Now $11.64
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was $20.29
58.2 ¢/fl oz
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Customer ratings & reviews

4.6 out of 5 stars
stars789 ratings251 reviews
How item rating is calculated
  1. 5 stars83% (653)
  2. 4 stars8% (66)
  3. 3 stars2% (18)
  4. 2 stars2% (14)
  5. 1 star5% (38)

Reviews summary

Pros

  • : Offers lower prices compared to other retailers.
  • : Improves idle and overall running smoothness.
  • : Simply adds to tank while refueling.
  • : Increases miles per gallon by around 1-2 mpg.
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Showing 1-3 of 251 reviews

Oct 29, 2025
Ernest
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

worth the money

I was hesitant to try this product. So often they don't do what they claim, but this works. My F-150 was not running up to par so I tried Royal Purple and by the time I ran one tank of gas through the truck, it idles perfect and the milage has even improved

Helpful?5J9T946RLAOX35513142
Dec 14, 2025
Todd
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Fuel Injector Cleaner that actually works

Ethanol will gunk up your fuel injectors. I use this or one other about every other oil change. I can't remember the stuff in it that is actually doing the work, but there are only 3 or 4 products that I've found that have it. You won't know how much your fuel injectors were clogged until they're clean again.

Helpful?5J9T946RLAOX35513142
Mar 24, 2026
Rich
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

The best fuel cleaner

If you have an older vehicle that is getting terrible gas mileage this is the miracle fix. I put this in my 200,000 mile car that was down to about 1516 miles to the gallon now I'm getting 18 miles to the gallon. This stuff is amazing. It is the only stuff I tried that cleaned my fuel injectors

Helpful?5J9T946RLAOX35513142