Cummins/Onan P2400 / P3500 — Changing Engine Oil
Maintenance
For the Cummins/Onan P2400 / P3500, from the Cummins/Onan service manual.
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Before you start
- Contact with used engine oil can cause cancer and reproductive toxicity. Avoid skin contact and breathing of vapors.
Procedure
- Remove the oil fill cap and drain plug.
- Drain the oil from the crankcase.
- Reinstall the drain plug securely.
- Add new oil up to the bottom edge of the oil fill hole with the engine stopped and level.
- Reinstall the oil fill cap and tighten it securely.
Specs & values
- Drain the oil while the engine is still warm.
- Engine Oil Capacity = 1.16 US quart (1.1 liters).
- Recommended Engine Oil: SAE 10W30 Amazon eBay $54.99.
Source: Cummins/Onan service 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.