34Oz. EZ Measure bottle mixes with 25 gallons of fuel. 

Opti-2 is a specialized two-cycle single mix ratio lubricant engineered for use in all two-cycle engines egardless 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.