Crankcase Gases (Blowby) 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
Crankcase Gases (Blowby) Excessive	Active DTC's or high counts of inactive DTC's	Check for active and inactive DTC's.	Work Flow
	Crankcase ventilation system is malfunctioning	Verify crankcase vent system operation.	Removal and Installation
	Lubricating oil level is above specification	Check the oil level. Verify the dipstick calibration and oil pan capacity. Fill the system to the specified level.	Inspection
	Engine angularity during operation excessive	Operate vehicle on a level surface and re-check.	-
	Crankcase pressure is excessive	Check for excessive blowby.	Removal and Installation
	Turbocharger oil seal is leaking	Check the turbocharger compressor and turbine seals. Replace the turbocharger, if necessary.	Inspection Inspection After Removal
	Valve stem clearance is excessive or the valve stem seals are damaged	Check the valve stems and seals.	Exploded View Inspection After Removal
	Cylinder head valve guides are excessively worn	Check the valve guides for wear. Replace the cylinder head, if necessary.	Removal and Installation Inspection After Removal
	Piston or piston rings are worn or damaged	Check for air intake system leaks. Analyze the oil and oil filter to locate an area of probable damage. Perform Compression test.	Inspection Inspection Compression Check Inspection After Removal