The Opti-2 20044 comes in one gallon bottles and mixes up to 110 gallons per bottle. All other 2 cycle oils mix to just 50 gallons of gas per 1 gallon of oil (50/1). Opti-2 is a specialized two-cycle, single mix ratio lubricant engineered for use in all two-cycle engines, regardless of brand, model, or mix ratio. Opti-2 is rated ISO-EG-D++, the highest rating available in the stringent International Standards Organization global performance ratings system. Opti-2 meets and exceeds all equipment manufacturers rating requirements.