The Cummins/Onan 4BTAA3.9-C125 is a 3.9 L engine rated at 2300 rpm. It powers generator sets from Atlas Copco, including the XAHS 206C, XAHS 350, XAHS 450 and XAS 186. It holds 9 L (2.4 gal) of oil and 19 L (5.0 gal) of coolant.
| Oil capacity | 9.0 L |
|---|---|
| Coolant capacity | 19.0 L |
| Displacement | 3.9 L |
| Rated speed | 2300 rpm |