The new Tier 4i-compliant G70WCU, G85WCU, and G125WCU generators feature a cooling system with a variable speed cooling fan. Airflow routes the engine heat, contributing to the lowest operating sound levels. Options include a Tundra Package, ensuring startup in extreme temperatures. The package includes a coolant heater, oil pan heater, battery charger, battery heater pad, and heated breather hose. Doosan Portable Power.