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, 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 5 in Fuel Stabilizer.
Last reviewed June 12, 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 Rainforest API 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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