Lubricating Oil Sludge in the Crankcase Excessive

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

Symptom	Possible Cause	Action	Reference
Lubricating Oil Sludge in the Crankcase Excessive	Bulk oil supply contaminated	Check the bulk oil supply. Drain the oil and replace with non-contaminated oil. Change the oil filter.	Changing Engine Oil Removal and Installation
	Lubricating oil does not meet specifications for operating conditions	Change the oil and oil filter.	Changing Engine Oil Removal and Installation
	Lubricating oil drain interval is excessive	Verify the correct lubricating oil drain interval.	Inspection
	Fuel grade is not correct for the application or the fuel quality is poor	Operate the engine from a tank of known high quality fuel. Refer to the following for the fuel specifications.	Cummins 5.0L Engine : Fluids and Lubricants
	Coolant temperature is below specification	Refer to the Coolant Temperature is Below Normal symptom diagnosis	Coolant Temperature Below Normal
	Lubricating oil is contaminated with coolant or fuel	Refer to the Lubricating Oil Contaminated symptom diagnosis.	Lubricating Oil Contaminated
	Lubricating oil temperature is above specification	If it is necessary replace the oil cooler. Check if the correct oil cooler part number is installed.	Removal and Installation
	Crankcase pressure is excessive	Check for excessive blowby. Refer to Crankcase Gases (Blowby) Excessive symptom diagnosis.	Crankcase Gases (Blowby) Excessive
	Exhaust system restriction is above or below specification	Check the exhaust system for restriction.	Checking Exhaust System