STIHL 0781 313 8010 6.4 Ounce High Performance Ultra 2 Cycle Engine Oil, 6 Pack Ultra lubricating qualities that are superior to other 2-cycle engine oils. This fully synthetic oil is also highly biodegradable 2-Cycle engine oil , Makes 2.5 Gallons Fully synthetic oil specially suited for high performance chain saws and power tools Outstanding engine cleaning characteristics