B5.9G, B5.9LPG, B Gas Plus, B LPG Plus – Lubricating Oil Consumption Excessive

Symptom Tree  

Verify the oil consumption rate

Check the amount of oil added versus the mileage.


Lubricating oil drain interval is excessive

Verify the correct lubricating oil drain interval. Refer to Procedure 018-003 (Lubricating Oil Recommendations and Specifications) in Section V.


Engine idle time is excessive

Low oil and coolant temperatures can be caused by long idle time (greater than 10 minutes). Shut off the engine rather than idle for long periods. If idle time is necessary, raise the idle speed. Procedure 018-003 (Lubricating Oil Recommendations and Specifications) in Section V


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 018-009 (Capscrew Markings and Torque Values) in Section V.


Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedure 007-002 (Lubricating Oil and Filters) in Section 4. Use the oil recommended in Section V.


Air compressor is pumping lubricating oil into the air system

Check the air lines for carbon buildup and lubricating oil. Refer to the OEM service manual or Procedure 012-003 (Air Compressor Carbon Buildup) in Section 7.

Contact a Cummins Authorized Repair Facility

Last Modified:  15-Feb-2005