CarCareTruth Score
Decent, but it's tough on the environment.
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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.
GHS Category 2 acute dermal toxicity — classified as toxic in contact with skin.
GHS Category 1 germ-cell mutagenicity — classified as suspected of causing heritable genetic damage.
GHS Category 1 carcinogenicity — classified as suspected of causing cancer with repeated or prolonged exposure.
If swallowed or on skin:
The aspiration hazard (H304) is about the liquid being swallowed and reaching the airway, not about breathing fumes during normal use.
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.
Health 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 2
H319 (eye irritation Cat 2A) in SDS §2. The pour step from concentrate into a fuel tank or gas can creates incidental splash risk.
U.S. regulatory standard
29 CFR 1910.133(a)(1)
“The employer shall ensure that each affected employee uses appropriate eye or face protection when exposed to eye or face hazards from… liquid chemicals…”
ANSI Z87.1 (incorporated via §1910.6)
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
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
Beyond SDS: translated from the ingredient chemistry
SDS §2 carries H311 (acute dermal toxicity Cat 3) and H315 (skin irritation Cat 2). Per the fuel-stabilizer category's PPE table, H311 maps to skin situational · not required. The brief pour step is not a prolonged skin-absorption scenario. H314 (skin corrosion/burns) is the required threshold; H314 is absent from §2 mixture classification (DMAE's H314 at ingredient level does not carry to mixture per GHS concentration rules). Gloves recommended when handling concentrate directly.
U.S. regulatory standard
29 CFR 1910.138(a); 1910.132(d)
“appropriate hand protection when employees' hands are exposed to hazards such as those from skin absorption of harmful substances.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Only when: in enclosed space · prolonged use
Translated from the manufacturer’s Safety Data Sheet, Section 2
H335 (respiratory irritation) in SDS §2. Aromatic solvent components contribute VOC. The short outdoor pour step at 1 oz dose is low inhalation risk; confined or poorly ventilated spaces warrant additional airflow.
U.S. regulatory standard
29 CFR 1910.1000; 1910.1200
“Each employer shall assure that no employee is exposed to an inhalation concentration of any substance shown in Tables Z-1, Z-2, or Z-3 in excess of the limits in the tables.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
The published Safety Data Sheet for this product does not specify ventilation protection for consumer use.
Workplace context
29 CFR 1910.134(a); 1910.1000
“the primary objective shall be to prevent atmospheric contamination [via] accepted engineering control measures (for example, enclosure or confinement of the operation, general and local ventilation, and substitution with less toxic materials).”
Triggered by GHS H335 on the SDS.
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
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 6 in Fuel Stabilizer.Three above it ↓
Last reviewed July 31, 2026
TL;DR Community evidence from small-engine, power equipment, and classic vehicle owners confirms reliable single-season (6-10 month) E10 protection and documented water-binding phase-separation behavior. The SDS assigns a DANGER signal word from H340/H350 (mutagen/carcinogen Cat 1B) and H304 (aspiration hazard) · handle the concentrate with care at the pour step and seek medical attention if swallowed. Multi-season data is not yet available for this 2024 product.
Ethanol Shield is purpose-built to address the specific problems that ethanol-blended pump gas creates during extended storage: phase separation, corrosion above and below the fuel line, and accelerated gum and varnish buildup. The label documents a phase separation inhibitor, an ASTM/NACE-rated all-metal anticorrosive package, and a superior antioxidant package · more specific than most generic fuel stabilizers. For single-season storage the community track record is strong: owners, who rate it highly across a large owner base, consistently report easy engine starts after winter storage in small engines, chainsaws, snow blowers, power washers, and motorcycles. The 2024 product launch means multi-year independent corroboration is not yet available to verify extended storage claims. Treatment economy at the storage dose (1 oz per gallon) is average for the category.
Best fit for seasonal small-engine owners, motorcycle riders, and outdoor power equipment users who store gasoline-powered equipment for 4-6 months and specifically need ethanol-phase-separation protection in addition to basic fuel freshness. The ASTM/NACE corrosion claim makes it a strong choice for equipment with aluminum or brass fuel system components. Skip it if you are storing fuel for less than a month or two · fresh sealed fuel over short durations does not need stabilization. Not suitable for diesel engines per the SDS.
DANGER. SDS §2 assigns H340 (germ cell mutagen Cat 1B), H350 (carcinogen Cat 1B), H304 (aspiration hazard · do not induce vomiting if ingested; seek medical attention), H311 (toxic by skin contact Cat 3), H315 (skin irritation), H319 (eye irritation), H335 (respiratory irritation), and H302 (harmful if swallowed). Prop 65 warning confirmed in SDS §15 (cancer and reproductive harm), consistent with H340 and H350. Skin PPE is situational · gloves recommended when handling concentrate directly (H311, H315). Per the fuel-stabilizer rubric, H311 maps to skin situational; H314 (skin corrosion) is the required threshold and is absent from the mixture classification. Lungs are situational · brief outdoor pour is the baseline scenario. Do not dispose of unused concentrate down a drain or storm drain; SDS §12 classifies benzotriazole as H411 (chronic aquatic Cat 2) · use a fuel or chemical recycling program.
The label documents three specific protection mechanisms: a phase separation inhibitor (prevents ethanol from absorbing water and separating from gasoline), an all-metal anticorrosive package rated to ASTM and NACE standards, and an antioxidant package to slow fuel aging. These are distinct from generic petroleum-based stabilizers and make the product specifically designed for modern E10/E15 pump gasoline.
The manufacturer markets this as a year-round treatment with implied multi-season capability. owners, who rate it highly, consistently confirm reliable starts after single off-season storage · small engines, snow blowers, power washers, and motorcycles. The product launched in 2024, so long-term multi-season community evidence (18+ months from independent sources) is not yet available to corroborate extended storage claims.
The DANGER signal word is driven by health-tier GHS codes in the SDS: H340 (mutagenicity Cat 1B) and H350 (carcinogen Cat 1B) from aromatic solvent components, H304 (aspiration hazard Cat 1 · the liquid can cause severe lung injury if swallowed), and H302/H311 (acute toxicity). The flash point is 62°C · combustible but not extremely flammable at room temperature. Keep away from heat and ignition sources.
The label states it is for all gasoline engines and explicitly includes power equipment, motorcycles, ATVs, marine engines, and automotive applications. The SDS restricts it to gasoline engines only · not diesel. owners specifically confirm use in chainsaws, lawn mowers, snow blowers, generators, power washers, and motorcycles with positive single-season outcomes.
The listing for Ethanol Shield Fuel Stabilizer carries a California Prop 65 warning. Ethanol Shield Fuel Stabilizer is a working automotive fluid rather than a passive part, so the warning points at the formulation itself. The manufacturer's Safety Data Sheet is the primary source for what is in it: the hazard classification and the PPE tiers on this page are translated from that sheet, and the full SDS is linked from the safety panel. California requires the warning whenever exposure to any of roughly 900 listed substances is possible. It does not name which substance applies to a given product, and it states no dose or risk level, so it is not on its own a measure of how hazardous this fluid is in normal use.
Marketing copy from Ethanol Shield, via Amazon. Not editorial.
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