Cummins/Onan Onan P4500i Inverter / P4500 — Engine Oil Change
Maintenance
For the Cummins/Onan Onan P4500i Inverter / P4500, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan P4500
Before you start
- Remove the spark plug boot and battery quick-connect plug when working on the generator.
- DO NOT overfill.
Procedure
- Place the generator on a level surface and allow the engine to cool several minutes.
- Remove the engine service cover and disconnect the spark plug wire.
- Remove the oil access cover.
- Clean around the oil dipstick, remove and wipe clean.
- Remove the rubber plug under the oil drain bolt and place an oil pan under the drain hole.
- Using a 10mm wrench, remove the oil drain bolt and allow the oil to drain.
- Install the oil drain plug and rubber plug; tighten securely.
- Slowly pour oil into the oil fill opening until level is between L and H marks.
- Replace the dipstick and hand-tighten.
- Connect the spark plug wire and install the engine service cover.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Maximum oil capacity: 0.63 US qt (0.60 L)
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.