Cummins/Onan GS-107-AC — Changing crankcase oil
Maintenance · Engine
For the Cummins/Onan GS-107-AC, from the Cummins/Onan service manual.
Applies to: Hol-Gar GS-107-AC, Cummins/Onan J120-S/967F engine
Before you start
- Do not start engine if oil is too cold to flow
Procedure
- Run engine until oil is warm.
- Drain oil from the oil base.
- Reinstall drain plug.
- Fill crankcase to FULL mark with proper grade (6 quarts).
- Check for leaks.
Specs & values
- Crankcase capacity 6 quarts
Full service-parts list: Hol-Gar GS-107-AC →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.