M11 – Lubricating Oil Consumption Excessive

Symptom Tree  

Verify the oil consumption rate

Check the amount of oil added versus the mileage.


Lubricating oil leak (external)

Inspect the engine for external oil leaks. Tighten the capscrews, pipe plugs, and fittings. Replace gaskets, if necessary. Refer to Procedure 018-006 (Engine Torque Values) in Section V.


Lubricating oil drain interval is excessive

Verify the correct lubricating oil drain interval. Refer to Procedure 102-002 (Maintenance Schedule) in Section 2.


Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedure 007-013 (Lubricating Oil Filters – Spin-on) in Section 4. Use the oil type recommended in Section V.


Crankcase ventilation system is plugged

Check and clean the crankcase breather and vent tube. Refer to Procedure 003-018 (Crankcase Breather Tube) in Section 3.

Contact a Cummins Authorized Repair Facility

Last Modified:  19-Nov-2004