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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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.
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, 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.
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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