The Cat? 320 GC offers you the ideal balance of dependable performance, operator productivity features, and reduced costs. Featuring a C4.4 engine with an aftertreatment system that requires no downtime and no Diesel Exhaust Fluid (DEF), the 320 GC meets China Nonroad Stage IV emission standards. The 320 GC is a smart choice for operations where high reliability and low-cost-per-hour performance are a priorities.