Cummins/Onan — Engine Oil Level Check
Maintenance · Engine lubrication system
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DQFAA, Cummins/Onan DQFAB, Cummins/Onan DQFAC, Cummins/Onan DQFAD, Cummins/Onan QST30-G5 engine
Before you start
- Do not check oil while the generator set is operating; crankcase pressure can blow out hot oil.
Procedure
- Remove the dipstick and wipe clean with a lint free cloth.
- Fully replace the dipstick.
- Remove the dipstick and check oil level against High and Low marks.
- Top up to the High mark if necessary with the correct grade of oil.
- Remove filler cap, place lint free cloth beneath filler neck, use a funnel to pour oil.
- Check oil level with dipstick; do not overfill.
- Replace dipstick and oil filler cap.
- Remove cloth, start engine, idle five minutes, switch off and wait five minutes.
- Check oil level; repeat if oil needs to be added.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Oil level between L (Low) and H (High) marks; top up to H mark
Full service-parts list: Cummins/Onan DQFAA →, Cummins/Onan DQFAB →, Cummins/Onan DQFAC →, Cummins/Onan DQFAD →
Source: Cummins/Onan operator's 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.