CarCareTruth Score
Decent, but it's tough on the environment.
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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.
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.
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Only when: splash risk
Translated from the manufacturer’s Safety Data Sheet, Section 8
SDS Section 8 calls for safety glasses. Section 2's GHS mixture classification is 'Not classified,' with no H318 or H319 at the mixture level, though the 0.1-1% trimethylbenzene fraction carries Eye Irrit. 2A (H319) and Section 11 reports a slight irritant effect on eyes. This is a splash-risk precaution during pour, not a mixture-level eye hazard.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Only when: splash risk · prolonged use
Translated from the manufacturer’s Safety Data Sheet, Section 8
SDS Section 8 calls for protective gloves that are impermeable and resistant to the product. Section 2's GHS mixture classification is 'Not classified,' with no H314 or H315 at the mixture level, though the 0.1-1% trimethylbenzene fraction carries Skin Irrit. 2 (H315) and Section 11 reports slight skin/mucous-membrane irritation plus dryness or cracking from repeated exposure.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Only when: handling concentrate · in enclosed space
Translated from the manufacturer’s Safety Data Sheet, Section 8
SDS Section 8 states breathing equipment is 'not required under normal conditions of use' but calls for a suitable respiratory protective device if ventilation is insufficient or if aerosol/mist forms, and notes respiratory protection 'may be advisable' for spills. Section 2 carries no H330/H331/H335 inhalation hazard code at the mixture level, and the 90-100% heavy paraffinic carrier has essentially zero vapor pressure at ambient temperature, so this is a ventilation- and concentrate-handling-dependent precaution, not a mixture-level respiratory hazard.
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 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.
Scope of these PPE tiers. The tiers on this page translate the product's Safety Data Sheet where one is published, plus its ingredient chemistry, into a comparable rating. They describe a formulation, not a situation: a tier is not a safety determination for any specific user, task, quantity, or environment. The manufacturer's label and use instructions govern how the product is handled. Where the product is used at work, the employer's PPE program and hazard assessment under 29 CFR 1910.132 decide what protection is selected, not this page.
No warranties. CarCareTruth makes no warranties, express or implied, and expressly disclaims the implied warranties of merchantability and fitness for a particular purpose.
This product ranks #4 of 16 in Fuel Injector Cleaner.Three above it ↓
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.
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 well-reviewed owner feedback; no independent IVD test data exists. Protocol: 32 oz treats 100 gallons at maintenance dose, double for known lubrication problems.
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.
SDS §2 mixture: "Not Hazardous" under GHS. The heavy paraffinic carrier (flash point 102°C) has negligible vapor pressure, well below the inhalation risk typical of aromatic-solvent additives · SDS Section 8 still calls for a respiratory device if ventilation is insufficient or aerosol/mist forms during handling. 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.
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.
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.
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.
Yes · the product 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.
Marketing copy from Rislone, via Amazon. Not editorial.
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