This small, natural gas engine offers low emissions while simultaneously providing world-class durability and reliability.  Available in the continuous duty cycle, the light gas g-drive engine provides an economical solution for gas applications. Offering the flexibility to run on fuels between propane and natural gas, the G5.9 Gas Low Emissions Series is capable of running down to 800 BTU/ft^3 with no derate. Designed to endure even the harshest conditions, this engine ensures the continuous run time that our customers demand.