The Cummins/Onan A4BTAA3.9-G4 is a 3.9 L turbocharged, charge air cooled engine rated at 1500 rpm. It powers generator sets from Cummins/Onan, including the C82.5D5P. It holds 16 L (4.2 gal) of oil and 19 L (5.0 gal) of coolant.
| Oil capacity | 16.0 L |
|---|---|
| Coolant capacity | 19.0 L |
| Displacement | 3.9 L |
| Aspiration | Turbocharged, Charge Air Cooled |
| Rated speed | 1500 rpm |