Yamaha Yamalube Outboard Fuel Stabilizer & Conditioner Plus

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; Amazon verified 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.