Cummins/Onan — Change Lubricating Oil and Filters
Maintenance
From a Cummins/Onan owner's manual covering: 6CTA8.3, CFP83-F10, CFP83-F20, CFP83-F30, CFP83-F40. Check it applies to your exact model before use.
Applies to: Cummins/Onan 6CTA8.3, Cummins/Onan CFP83-F10, Cummins/Onan CFP83-F20, Cummins/Onan CFP83-F30, Cummins/Onan CFP83-F40, Cummins/Onan 6CTA8.3G2 engine, Cummins/Onan 6CTAA8.3G3 engine
Before you start
- Avoid direct contact of hot oil with your skin.
- If no oil pressure is noted within 15 seconds after the engine is started, shut down the engine.
- Used engine oil can be carcinogenic.
Procedure
- Operate the engine until the water temperature reaches 60°C [140°F], then shut the engine off.
- Remove the oil drain plug and drain the oil immediately.
- Using an oil filter wrench, remove the filter and clean the gasket surface of the filter head.
- Apply a light film of clean 15W-40 oil to the new filter gasket.
- Fill the filter with clean 15W-40 oil.
- Install the filter; tighten until the gasket contacts the filter head surface.
- Clean and install the oil drain plug. Torque: 50 N•m [37 ft-lb].
- Fill the engine with clean oil to the proper level using the fill tube on the side of the engine.
- Operate the engine at idle to inspect for leaks at the filters and drain plug.
- Stop the engine, wait approximately 15 minutes, then check the oil level and top off.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Oil drain plug torque 50 N•m [37 ft-lb]
- Oil capacity of pan (high-low) 18.9-15.1 litre
- Total system capacity 23.8 litre
Full service-parts list: Cummins/Onan CFP83-F10 →, Cummins/Onan CFP83-F20 →, Cummins/Onan CFP83-F30 →, Cummins/Onan CFP83-F40 →
Source: Cummins/Onan owner'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.