CarCareTruth Score
Decent, but it's tough on the environment.
Priced as of June 10, 2026
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Prices may varyThe manufacturer's Safety Data Sheet classifies this product with one or more GHS Category 1 health hazards — the most severe tier. The hazard statements in quotes below are the verbatim GHS language from the SDS, as required by OSHA's Hazard Communication Standard. The line under each statement translates the GHS classification into plain language.
GHS Category 1 aspiration toxicity — thin, oily liquids can slip into the lungs if swallowed, causing chemical pneumonia.
If swallowed, inhaled, or splashed in eyes:
Call Poison Control immediately at 1-800-222-1222 (US, 24/7, free) and have the product container with you. Poison Control's standing guidance is to not induce vomiting after chemical exposure; they will direct first-aid steps based on the specific product.
About this product's hazards. This product's Safety Data Sheet uses signal word danger. Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate the manufacturer's safety sheet. They do not replace the SDS or substitute for a hazard assessment specific to your task.
This product ranks #3 of 7 in Fuel System Cleaner.
Last reviewed June 10, 2026
TL;DR PEA-based multi-system cleaner (injectors and intake valves are the well-supported zones; combustion chamber coverage is the brand's claim and plausible with co-active chemistry, but unverified by independent testing) with a clear 5,000-mile maintenance protocol and EPA registration confirming O2-sensor and catalytic-converter safety.
The Rislone 4700 uses a detergent active the brand calls a "Premium P.E.A. Formula" and is marketed as a six-in-one additive: the brand bundles complete fuel-system and injector cleaning, upper-cylinder lubrication, fuel stabilizing and conditioning, dry-gas water removal, gas treatment, and an octane boost. On the cleaning side, the label targets injectors, intake valves, and combustion chambers. Pour one bottle into the tank at fill-up, repeat every 5,000 miles. The detergent chemistry class has strong research support for injector and intake valve deposits; combustion chamber coverage is claimed by the brand and plausible with co-active chemistry, but no independent test data specific to this product has been documented. Community feedback is broadly positive for engines with deposit buildup from inconsistent fuel quality or extended service intervals, with mixed results on well-maintained vehicles.
Gasoline vehicle owners with rough idle, hesitation, or mileage softness from suspected deposit buildup will find the EPA-registered formula and confirmed O2-sensor and catalytic-converter safety a practical choice at a competitive price. Skip it if you consistently use Top Tier certified gasoline: the baseline detergent package in Top Tier fuel prevents deposit accumulation, leaving little for a pour-in cleaner to address. Also skip for misfires, rough idle that persists after a full treatment, or confirmed injector failure: those call for professional ultrasonic injector cleaning or intake manifold service, not a maintenance additive. Direct-injection engine owners should confirm GDI valve coverage with Rislone before use.
The SDS signal word is DANGER, driven by the aspiration hazard classification (H304): the concentrate can cause lung damage if swallowed and aspirated, so do not induce vomiting if ingested and seek medical attention immediately. No eye-irritation, skin-irritation, or respiratory-irritation codes appear in the SDS §2 mixture classification, but the carrier is volatile (flash point 84-87°C) with aromatic solvents present per state regulatory listings; pour outdoors or ensure ventilation in enclosed spaces, and avoid prolonged skin contact. The product enters the fuel tank and combusts: the environmental endpoint is exhaust, not drains or waterways.
Yes. The Amazon listing states the product will not void the manufacturer's new vehicle warranty and is safe to use on vehicles with oxygen sensors and catalytic converters. It is EPA registered.
No documented incompatibility with ethanol-blend fuels has been reported, but the brand makes no explicit compatibility claim on the label or product page for E10, E15, or E85 applications. Verify with the manufacturer before use in high-ethanol-blend applications.
No documented incompatibility with carbureted engines has been reported, but the brand makes no explicit carbureted-engine compatibility claim. Verify with the manufacturer before use in carbureted applications.
The brand makes no GDI-specific claim. PEA chemistry can address intake valve deposits in GDI engines via vapor transport, but direct injection means fuel does not wash the intake valves directly, limiting effectiveness compared to port-injected engines. No GDI-specific evidence for this product is documented.
The label recommends one bottle per 16 gallons of fuel every 5,000 miles for ongoing maintenance. Use at any fill-up when system-wide deposits are suspected.
Yes. The Amazon listing carries a California Prop 65 warning. Xylene is confirmed present via SDS §8 OEL listing and §13/§15 state regulatory sections. Xylene is a Prop 65-listed carcinogen.
Marketing copy from Rislone, via Amazon. Not editorial.
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