Cummins/Onan 5MDKAU — Changing Engine Oil and Filter
Maintenance · engine oil and oil filter
For the Cummins/Onan 5MDKAU, from the Cummins/Onan service manual.
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Before you start
- Disconnect negative (-) battery cable to prevent accidental starting
- Avoid skin contact and breathing of used oil vapors
Procedure
- Run genset under load to operating temperature, stop it, disconnect negative battery cable.
- Remove oil fill plug, open front access door, drain oil through drain valve.
- Close the oil drain valve.
- Spin off old oil filter and wipe the filter mounting surface.
- Apply oil film to new filter gasket, spin on by hand and tighten 3/4 turn.
- Refill with 2.2 quarts (2.1 l) of oil.
- Run five minutes, check for leaks, stop and check oil level.
- Dispose of used oil and filter per local regulations.
Tools required
- filter wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 2.2 quarts (2.1 l) of oil
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.