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. Opti-2 delivers all these features while being the most environmentally.. See full description for further details