Cummins/Onan QSX15 / QSx15 — Lubricating Oil and Filters - Fill
Maintenance · lubricating oil system
For the Cummins/Onan QSX15 / QSx15, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan QSx15, Cummins/Onan QSX15 engine
Before you start
- Lack of engine lubrication while filter is pumped full of oil is harmful to the engine.
- Mechanical overtightening can distort threads or damage filter element seal.
Parts for this job
Part numbers from the service-parts list for Cummins/Onan QSx15. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Fill the oil filter with clean lubricating oil before installing it on the engine.
- Use combination full-flow/bypass lubricating oil filter Cummins Part No. 3406810 or Fleetguard Nelson LF-9000.
- Apply a thin film of lubricating oil to the filter gasket before installing.
- Tighten filter an additional 3/4 turn after gasket contacts filter head surface.
- Fill engine with clean oil to correct level.
- Operate engine at idle and inspect for leaks. Shut off and wait 15 minutes. Check oil level again.
Tools required
- 3375049 Oil and Fuel Filter Wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Total system capacity for standard engine including filter is 49.2 liters [12 gal].
- After oil change, standard engine requires approximately 45.4 liters [11 gal] to fill oil pan and 3.8 liters [1 gal] to fill new oil filter.
- Oil drain plug torque: 47 Nm [35 ft-lb]
Full service-parts list: Cummins/Onan QSx15 →
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.