The Cummins/Onan GTA28 is a 28 L 12-cylinder turbocharged & aftercooled engine rated at 1800 rpm, producing up to 770 kW. It powers generator sets from Cummins/Onan, including the GFGA. It holds 5.5 L (1.5 gal) of oil and 45 L (11.9 gal) of coolant.
Also known as: Cummins GTA28
Part of the Cummins/Onan GTA28 engine family — 2 variants share parts & fitment.
| Oil capacity | 5.5 L |
|---|---|
| Coolant capacity | 45.0 L |
| Displacement | 28.0 L |
| Cylinders | 12 |
| Aspiration | Turbocharged & Aftercooled |
| Rated speed | 1800 rpm |
| Gross power | 770 kW |
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Cummins NPower | — | find | ||
| Fuel filter | Cummins NPower | — | find | ||
| Oil filter | Cummins NPower | — | find | ||
| Belt | Cummins NPower | — | find | ||
| Coolant | 170.0 | — | |||
| Coolant filter | — | find | |||
| Oil | Multi-viscosity or straight weight single viscosity NATURAL GAS ENGINE OIL that meets Mil-2104A(CB), Mil-2104B (CC), Mil-2104C (CD/SC), CE and CF-4 specification. Ash Content between .15 and .85 of one percent. | 29.7 gal | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
The Cummins/Onan GTA28 engine has an oil capacity of 5.5 liters.
The Cummins/Onan GTA28 has a displacement of 28.0 liters with 12 cylinders.
The Cummins/Onan GTA28 powers 1 generator set(s), including Cummins/Onan GFGA.