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.
If swallowed:
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 2) is confirmed in MSDS §2 narrative and back label ('Causes eye irritation'). H319 maps to situational; only H318 (serious eye damage) would escalate to required. The main exposure point during the concentrate pour is splash when directing liquid into a narrow fuel tank opening.
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: prolonged use · handling concentrate
Translated from the manufacturer’s Safety Data Sheet, Section 2
H315 (skin irritation Cat 2) confirmed from MSDS §2 narrative and back label ('Causes skin irritation'). H315 maps to situational; H317 (skin sensitizer) would be required for a recommended tier. The brief pour step is the realistic skin contact scenario. SDS §8 boilerplate calling for gloves is standard CYA language and does not override the H-code threshold.
U.S. regulatory standard
29 CFR 1910.138(a)
“appropriate hand protection when employees' hands are exposed to hazards such as those from… chemicals which produce an adverse effect on the skin or eyes…”
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 STOT SE Cat 3) confirmed from MSDS §2 narrative and back label ('Inhalation of fumes may result in dizziness, headache and respiratory irritation'). H335 without elevated VOC maps to situational. The base carrier (>90% heavy naphthenic distillate, flash point 105°C) is low-volatility; vapor accumulation during a brief outdoor pour is negligible. Pouring in an enclosed garage with poor ventilation is the trigger scenario.
U.S. regulatory standard
29 CFR 1910.1000; 1910.1200
“Each employer shall assure that no employee is exposed [in excess of the PEL]…”
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 #2 of 6 in Fuel Stabilizer.
Last reviewed July 31, 2026
TL;DR Community reviews from wave runner, generator, and small-engine owners confirm reliable single-season protection for E10 pump gas. The product's SDS carries a DANGER signal word driven by an aspiration hazard (H304) and a Prop 65 cancer warning from a trace ingredient. If concentrate is swallowed, do not induce vomiting · seek medical attention immediately.
Yamalube Fuel Stabilizer & Conditioner Plus is Yamaha's OEM additive for outboard motors and other gasoline-powered equipment. The alcohol-free formula is explicitly designed for E10 ethanol blends, helping prevent phase separation and oxidation during extended storage. Yamaha claims up to 12 months of protection; owner reviews from outboard, wave runner, generator, and small-engine owners consistently report positive outcomes, though dedicated marine-forum multi-season corroboration is not available in the current research record. A named corrosion inhibitor in the formula targets carburetor passages and metal fuel system components. The storage dose is high at 1 oz per gallon, which limits value-per-gallon compared to more concentrated alternatives in the category.
Best fit for Yamaha outboard and wave runner owners who prefer using OEM-sourced additives, and small-engine owners storing equipment for one off-season who want a well-reviewed formula with explicit E10 coverage. Skip it if you're storing fuel for less than a month or two, where fresh fuel in a sealed tank does not need stabilization. The high storage dose (1 oz per gallon) makes this a more expensive option for large-tank applications compared to more concentrated stabilizers.
The SDS carries a DANGER signal word driven by H304 (aspiration hazard) from the petroleum distillate base, not by flammability. Flash point is 105°C, well above the flammable-liquid threshold. The aspiration hazard means the swallow-and-vomit scenario is the critical risk: if concentrate is swallowed, do not induce vomiting and seek medical attention. H315 (skin irritation) and H319 (eye irritation) are present from the solvent fraction. H335 (respiratory irritation) applies during the pour step in an enclosed, poorly ventilated space. A trace naphthalene component (0.01-0.03%) triggers a California Prop 65 cancer warning. The product is burned with the fuel; it is classified as drain-destined with a combustion/exhaust pathway, which is why the environment score reflects the category ceiling rather than any individual formulation risk.
Yamaha claims up to 12 months of protection during storage. Owner reviews from wave runner, generator, and small-engine users consistently report positive outcomes across a single off-season. Multi-season independent evidence from dedicated marine or collector forums is not available in the current research record, so single-season protection (6-10 months) is the well-supported case. For storage beyond 12 months, re-treating before the next storage period is the conservative approach.
Yes. The product is explicitly recommended for E10 fuels. The formula is alcohol-free, which Yamaha positions as an advantage over IPA-containing stabilizers that can contribute to phase separation. No community reports of E10 phase separation failures appear in the owner-review base. The specific ethanol-stabilizing active is proprietary and not identified by name in the SDS.
The formula is a petroleum-based concentrate not chemically restricted to Yamaha engines. owners report use across wave runners, generators, lawn mowers, and other small gasoline engines. The product is marketed as an outboard/marine stabilizer but the stabilization and corrosion inhibition mechanism is not engine-specific.
For continuous use, the recommended dose is 1 oz per 3 gallons of fresh gasoline. For storage over 2 months, increase to 1 oz per 1 gallon. Run the engine for several minutes after adding to circulate the treated fuel through the system, then top off the tank to minimize air space and condensation.
Yes. The back label carries a California Prop 65 cancer warning for naphthalene, which is present as a trace component (0.01-0.03%) from the petroleum distillate fraction. The product listing returned a false negative on this field · the back-of-bottle label is authoritative and confirms the warning.
Marketing copy from Yamaha, via Amazon. Not editorial.
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