Cummins/Onan Onan P4500i Inverter / P4500 — Initial Oil Fill
Maintenance · Engine
For the Cummins/Onan Onan P4500i Inverter / P4500, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan P4500
Before you start
- This generator has been shipped without oil; failure to add engine oil before starting will result in serious engine damage.
Procedure
- On a level surface, remove the oil access cover and oil dipstick.
- Using the supplied funnel and oil, add oil into the engine.
- Replace the oil dipstick and hand-tighten.
- Replace the oil access cover.
Tools required
- Funnel Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Oil capacity: 0.63 US qt (0.60 L)
- Oil type: 10W-30 Amazon eBay $54.99
Full service-parts list: Cummins/Onan P4500 →
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.