Cummins/Onan Onan P4500i / P4500 — Checking 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
- Allow crankcase pressure to equalize before removing dipstick.
Procedure
- Operate/maintain inverter on a flat surface.
- Stop engine if running.
- Let engine cool for several minutes.
- Remove oil service panel to access oil plug/dipstick.
- Clean around oil plug/dipstick with a damp rag.
- Remove the oil plug/dipstick.
- Check oil level; oil should be visible on the dipstick's cross threads.
- If low, add oil using the supplied oil fill bottle; do not overfill.
Tools required
- Oil fill bottle Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- SAE 10W-30 Amazon eBay $54.99 4-stroke FridayParts $11.50 oil
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.