The Cummins/Onan ISC is a 6-cylinder turbocharged (holset wastegated turbo) engine rated at 2200 rpm, producing up to 179 kW. It powers generator sets from Cummins/Onan, including the ISC 260, ISC 285, ISC 300 and ISC 315. It holds 23.8 L (6.3 gal) of oil.
Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
|---|
| Fuel filter | Change secondary fuel filter | | — | 30000 hr | |
| Oil filter | Cummins | | — | 15000 hr | |
| Battery | none | | — | | |
| Belt | Check and adjust timing belt | | — | 5000 hr | |
| Coolant | Replace coolant and thermostat as needed | | — | | |
| Coolant filter | NONE* | | — | | |
| Oil | Change oil and filter | 6.3 liters | — | 15000 hr | |
| Spark plug | Check and replace spark plugs as needed | | — | 48000 hr | |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
Common questions
What is the oil capacity of the Cummins/Onan ISC?
The Cummins/Onan ISC engine has an oil capacity of 23.8 liters.
Which generators use the Cummins/Onan ISC engine?
The Cummins/Onan ISC powers 5 generator set(s), including Cummins/Onan ISC 260, Cummins/Onan ISC 285, Cummins/Onan ISC 300, Cummins/Onan ISC 315, Cummins/Onan ISC 330.
How often should you change the oil in the Cummins/Onan ISC?
The Cummins/Onan ISC oil change interval is every 15000 hours.