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, 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 #4 of 5 in Fuel Stabilizer.Three above it ↓
Last reviewed June 12, 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.
Marketing copy from Ethanol Shield, via Amazon. Not editorial.
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