M11 Plus Series Engines Operation and Maintenance Manual – Lubricating Oil Sludge in the Crankcase Excessive

Bulk oil supply is contaminated

Check the bulk oil supply. Drain the oil and replace with noncontaminated oil. Clean the Eliminator oil filter centrifuge. Refer to Procedure 007-002 (Lubricating Oil and Filters) in Section 4.

Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedure 007-013 (Lubricating Oil Filter – Spin-on) in Section 4.

Lubricating oil drain interval is excessive

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

Fuel grade is not correct for the application or the fuel quality is poor

Operate the engine from a tank of high-quality fuel. Refer to Procedure 018-002 (Fuel Recommendations and Specifications) in Section V.

Coolant temperature is below specification

Refer to the Coolant Temperature Below Normal symptom tree.

Crankcase ventilation system is plugged

Check and clean the crankcase breather and vent tube. Refer to Procedure 003-018 (Crankcase Breather Tube) in Section 5.