Cummins/Onan Onan P4500i / P4500 — Changing Engine Oil
Maintenance
For the Cummins/Onan Onan P4500i / P4500, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan Onan P4500i, Cummins/Onan P4500
Before you start
- Never dispose of used oil in a sewer, on the ground, or into waterways.
Procedure
- Stop the engine.
- Let engine cool for several minutes.
- Remove the oil service panel.
- Place oil pan under rubber plug below the oil service panel.
- Remove rubber plug to drain oil from the bottom.
- Remove oil drain bolt with a 10mm wrench to allow draining.
- Allow oil to fully drain; dispose of properly.
- Refill crankcase with oil and tighten the oil plug.
- Wipe excess oil, replace rubber cap and drain bolt, replace access panel.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Oil capacity 0.60 L (20.3 oz)
Full service-parts list: Cummins/Onan Onan P4500i →, 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.