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Hy-per Fuel Injector Cleaner Heavy Duty

  • Maximizes Power & Mileage
  • Upper Cylinder Lubricant
  • Cleans Fuel Injectors
  • For Gasoline & Diesel Engines

Powerful, affordable performance – now in a larger size.

Rislone Hy-per Fuel Injector Cleaner — the best all-around fuel additive to use with every tank of gas. From the outset, we engineered it to be far better than your average fuel additive. And we succeeded.

This heavy-duty, larger size (32 oz) complete fuel injector tune-up helps eliminate noisy injectors and fuel pumps, rough idle, hard starting and hesitation. Its high-performance additives increase power, performance, acceleration response and fuel efficiency. Perfect for use with all gasoline, ULSD diesel and E85 Flex-Fuel engines, as well as all unleaded, oxygenated, reformulated and biofuels.

Product Support:

Product Details

Part Number: 4732

Dosage: One bottle treats 100 gallons of gasoline or diesel fuel

Size: 32 FL. OZ. (950 mL)

SDS / Tech Info:
SDS Open Download
Tech Sheet Open Download

Frequently Asked Questions

Additional Product Info

Rislone® Hy-per Fuel™ Heavy Duty Injector Cleaner with Fuel Conditioner & Top Lube is the best all-around fuel additive to use with every tank of fuel. This complete fuel system tune-up helps eliminate noisy injectors & fuel pumps, rough idle, hard starting and hesitation. Heavy Duty additives increase power, performance, mileage and help save fuel by cleaning & lubricating fuel injectors. Regular use, summer and winter, maintains optimum engine efficiency and power. Use in gas, ethanol and diesel cars, SUV’s, trucks, RV’s, fuel injected, carbureted, turbo, GTDI and direct injected engines. Works with all types of fuel including regular & unleaded gasoline, ULSD Ultra Low Sulfur Diesel, E85 Ethanol and other reformulated and bio-fuel formulas.


  • Upper Cylinder Lubricant UCL helps prevent cylinder, ring & piston wear along with lubricating valves & guides giving longer engine life.
  • Will not void manufacture’s new vehicle warranty and safe to use on vehicles which have oxygen sensors, catalytic converters or DPF filters.
  • Exceeds EPA compliance performance criteria and is EPA registered.
  • Results will either be immediate or noticeable within a few days of driving. Non-solvent formula contains petroleum oils.
  • Premium P.E.A. Polyetheramine New Generation Detergent Patented Formula is a multifunctional additive improving the quality of fuel.
  • Cleaning Engines Since 1921
  • Increases Power, Boosts Performance & Mileage and Saves Fuel by Cleaning & Lubricating Fuel Injectors.
  • Helps Eliminate Noisy Injectors & Fuel Pumps, Smooths Rough Idle, Hard Starting and Hesitation.
  • Smoothes rough idle and eliminates hard starts giving cleaner, quieter operation.
  • The Fuel Conditioner & Top Lube protects and lubricates all parts of the fuel system including the fuel pump and injectors allowing more power & performance.


UCL – Upper Cylinder Lubricant Top Lube
The Rislone UCL additive is specially designed to lubricate the upper cylinder of an engine; however this action starts in the fuel tank. This UCL formulation helps overcome the lack of lubrication in modern fuels including unleaded gasoline, ULSD diesel fuel, E85 Ethanol, and other oxygenated and bio fuels. In the fuel tank, UCL helps prevent rust & corrosion and this process continues into the fuel lines. UCL also lubricates and protects the fuel pump, giving it a longer life and quieter operation. The next step for the UCL formula is to lubricate the injectors allowing them to work more efficiently. Not only are cylinder deposits cleaned, including gum and varnish, but as the UCL treats the upper cylinder the lubricating film helps to prevent carbon from sticking so that it can be burned. This film completely lubricates the upper piston, rings, guides, valves, and seats.

Directions / Dosage:
P/N 4732 / 32 ounce bottle – One bottle treats 100 gallons of gasoline or diesel fuel. For smaller or larger systems add approximately 3 ounces for every 10 gallons of fuel.

P/N 4701-5 / 5-gallon pail, 4701-55 / 55-gallon drum – Add 3 ounces for every 10 gallons of fuel.

For vehicles with known fuel lubrication problems, double the dosage.

Results will either be immediate or noticeable within a few days of driving.

This diesel fuel additive complies with the federal low sulfur content requirements for use in diesel fuel motor vehicles and non-road engines.

Available At:

Rislone products are available where auto parts are sold.

Customer Reviews

Don’t just take our word for it. Our customers have been using our products for decades.
If you have a story to tell, let us know.


“Flat out the best fuel injector cleaner I’ve ever tried. Use in my ’11 F150 and older ’87 Mustang 5.0 fox body. I wasn’t familiar with Rislone until it was recommended to me, and it’s awesome. Thanks for a great product that works as advertised.”

– Adam C.

“I have used and compared to many many competitors. Absolutely amazing! Quick working, very noticeable improvements, crisp precise firing that eliminates much vibration. Some competitors gouge you for price and do not work as well. This is a gift in price for what it will do for your engine.
With our shitty gasoline today (10% alcohol weakening the power of detonation and its corrosive action) the protection of the upper cylinder lubricant is critically important to safeguard the mechanical efficiency of delivery. Without it, effectively the correct computer demands are “ignored” and you will get inappropriate low performance. This concentrate is the very best deal i know of for basic, necessary, continuous, timely preventative maintenance and is required in every tank of gas for constant top performance, gas mileage, vibration elimination, proper firing and power.
All things considered your rings may well be first to go and this product will cut the friction and eliminate unnecessary heat and wear. Another inferior product claims a 67% increase in ring life….if true this product should do a much BETTER job! If you need to keep your car “forever” you definitely need this product. First time I tried this product I was shocked how well it worked right out of the gate! Unbelievably “GREAT stuff” at any price!”

-William E.

“Great Formula.

I found that I got better mileage with lower grade fuel while using this product.”

– G. Smith