Rislone Hy-per Fuel Heavy Duty Injector Cleaner
Priced as of May 29, 2026
4.5(302 ratings)Subscribe & Save: $12.93 (5% off)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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Prices may varyHealth score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
From the Safety Data Sheet
Full SDS ↗ (rev. 2020-12-14)GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
EyesSituationalMfr. SDS §8SkinSituationalMfr. SDS §8Lungs—No PPE in published sourcesVentilation—No PPE in published sourcesShow details for all categories ▾Hide details ▴
From the manufacturer’s Safety Data Sheet, Section 8
“No H318 or H319 in SDS §2 mixture-level classification (product is 'Not classified' under GHS). Ingredient-level H319 appears at 0.1-1% TMB — brief eye contact risk during pour warrants splash-risk precaution.”
— Rislone
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“No H314 or H315 in SDS §2 mixture-level classification. Ingredient-level H315 appears at 0.1-1% TMB. Heavy paraffinic oil concentrate contact during pour warrants splash-risk skin precaution.”
— Rislone
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for lungs. Absence does not imply “not needed” — consult the full Safety Data Sheet.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
The Podium · Top 3 in Fuel Injector Cleaner
See the full ranking →This product ranks #3 of 11 in Fuel Injector Cleaner.
- Gold · #1Red LineSI-1 Complete Fuel System CleanerCCT 6.8
- Silver · #2ChevronTechron Concentrate Plus Complete Fuel System CleanerCCT 6.7
- Bronze · #3You're hereRisloneHy-per Fuel Heavy Duty Injector CleanerCCT 6.6
CarCareTruth's Analysis
Last reviewed May 29, 2026
TL;DR Rislone 4732 combines a PEA-formula injector cleaner with an upper cylinder lubricant in one pour-in treatment. The label names PEA (the most-studied injector detergent class) as the active, but the US SDS lists a trade-secret compound under a different chemistry name. The 32 oz format treating 100 gallons is strong value. Carries a Prop 65 warning for trace aromatic components.
What it is and how it performs
A dual-function maintenance treatment: PEA-formula injector cleaning plus upper cylinder lubrication (UCL) for low-lubricity modern fuels. The brand's PDS lists PEA as the active; the US SDS identifies the detergent as a trade-secret compound under a distinct chemistry designation at undisclosed concentration. Efficacy rests on brand claims and 302 Amazon reviews at 4.5 stars; no independent IVD test data exists. Protocol: 32 oz treats 100 gallons at maintenance dose, double for known lubrication problems.
Who should buy this — and who should skip it
Best for owners on non-Top-Tier fuel — broad compatibility across gasoline, diesel, E85, and ethanol blends with explicit O2-sensor, catalytic-converter, and DPF-safe confirmation from the PDS. Skip it if you consistently run Top Tier certified fuel (the OEM detergent package covers injector maintenance). Skip it and seek professional ultrasonic cleaning if the symptom is severe rough idle or a confirmed injector flow failure.
Safety and environmental impact
SDS §2 mixture: "Not Hazardous" under GHS. The heavy paraffinic carrier (flash point 102°C) has negligible vapor pressure, eliminating the inhalation risk typical of aromatic-solvent additives. Prop 65 warning confirmed for trace components (cumene, ethylbenzene). Do not induce vomiting if ingested — seek medical attention. The product combusts in the engine; exhaust is the environmental endpoint.
Frequently asked questions
Does Rislone 4732 work with diesel engines?▾
Yes — the label and product data sheet confirm compatibility with ULSD ultra-low-sulfur diesel, E85 ethanol, and all reformulated and bio-fuel formulas, in addition to regular and unleaded gasoline.
Is Rislone 4732 safe for catalytic converters and oxygen sensors?▾
The brand's product data sheet explicitly states it will not void manufacturer new vehicle warranties and is safe for vehicles with oxygen sensors, catalytic converters, and DPF filters.
How much does one bottle treat?▾
One 32 oz bottle treats 100 gallons of fuel. For maintenance dosing, the label recommends approximately 3 oz per 10 gallons. For vehicles with known lubrication problems, the brand recommends doubling the dosage.
Does Rislone 4732 carry a Prop 65 warning?▾
Yes — the Amazon listing carries a California Prop 65 warning. SDS §15 identifies trace quantities of cumene, ethylbenzene, and aromatic naphtha as the Prop 65 cancer-listed components.
From the manufacturer
Marketing copy from Rislone, via Amazon. Not editorial.
- •CLEANS FUEL INJECTORS: This heavy-duty, larger size (32 oz) complete fuel system tune-up helps eliminate noisy injectors & fuel pumps, rough idle, hard starting and hesitation.
- •SMOOTHES ROUGH IDLE AND ELIMINATES HARD STARTS: High performance 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 WITH ALL GASOLINES AND FUELS: Works with all types of fuel including regular & unleaded gasoline, ULSD Ultra Low Sulfur Diesel, E10 E15 E85 Ethanol and other reformulated and bio-fuel formulas.
- •WORKS WITH ALL FUEL INJECTED AND CARBURATED ENGINES: Use in gas, ethanol and diesel cars, SUV’s, trucks, RV’s, fuel injected, carbureted, turbo, GTDI and direct injected engines.
- •MADE IN THE USA
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Manufacturer videos
Manufacturer images
Manufacturer specifications
- Flavor
- Do not eat
- Number of Items
- 1
- Unit Count
- 32.0 Fluid Ounces
- Brand
- Rislone
- Age Range (Description)
- Adult
- Brand Name
- Rislone
- Age Range Description
- Adult
- UPC
- 078615047321
- Global Trade Identification Number
- 00078615047321
- Set Name
- No Set
- Part Number
- 4732
- Model Number
- 4732
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Top Amazon review
↗External — Amazon's most-helpful review for context.
GREAT PRODUCT
Great product! This stuff is helping my truck run great. I live in an area that there is not 1 good fuel station with certified gasoline with cleaning additives. At least not that I have discovered. By adding this product my truck is getting the lubrication it needs and the cleaning agents it requires to keep the injectors plus the O2 sensors healthy. It works and MADE IN THE USA!