Cummins/Onan 5.5 NH / 6.5 NH — Oil and Filter Change
Maintenance · engine lubrication
For the Cummins/Onan 5.5 NH / 6.5 NH, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan NH engine
Before you start
- Hot crankcase oil can cause burns if spilled or splashed on skin.
- Wipe up oil spills immediately to avoid an accident due to slipping.
- Disconnect the negative battery cable before performing maintenance.
Procedure
- Drain oil while the engine is warm by removing the oil drain plug; replace drain plug.
- Remove oil level indicator and refill with new oil of the proper grade and viscosity; replace indicator.
- Place a pan under the oil filter and remove by turning counterclockwise.
- Coat new oil filter gasket lightly with oil and install filter.
- Turn clockwise until gasket touches mounting base, then tighten an additional 1/2 turn.
Specs & values
- Oil filter change interval every 200 hours
- Engine oil capacity 3-1/2 Qt (3.3 L) with filter
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.