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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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NO.16 HIGH OIL CONSUMPTION/LEAKAGE [SKYACTIV-G 2.0]

16	HIGH OIL CONSUMPTION/LEAKAGE
DESCRIPTION	Oil consumption is excessive.
POSSIBLE CAUSE	Improper oil level gauge Improper engine oil viscosity Oil leakage PCV valve malfunction Engine internal parts malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	ADD ENGINE OIL NOTE: Add engine oil to the Full position because the validity of the engine oil consumption is determined. Visually verify the engine oil level. Is the engine oil level at the Full position?	Yes	Go to the next step.
		No	Add engine oil to the Full position, then go to the next step.
2	DETERMINE IF ENGINE OIL CONSUMPTION IS REASONABLE Record the current traveled distance. Have the customer drive the vehicle 1,931 km {1,200 mile}. Is the engine oil level appropriate?	Yes	Complete the symptom troubleshooting.(Explain to the customer that it is normal for the engine oil level to decrease from Full to Low after driving the vehicle 1,931 km {1,200 mile}.)
		No	Go to the next step.
3	INSPECT ENGINE OIL VISCOSITY Inspect the engine oil viscosity. Is the engine oil viscosity appropriate?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location, then go to Step 6.
4	INSPECT FOR ENGINE OIL LEAKAGE Inspect for engine oil leakage from the outside of the engine. Is there engine oil leakage?	Yes	Repair or replace the malfunctioning location, then go to Step 6.
		No	Go to the next step.
5	DETERMINE IF MALFUNCTION CAUSE IS DUE TO PCV VALVE OR INTERNAL ENGINE MALFUNCTION Inspect the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [SKYACTIV-G 2.0].) Is the PCV valve normal?	Yes	Inspect for internal engine wear, damage. Cylinder Piston ring Intake/exhaust valve Cylinder head gasket If there is any malfunction: Repair or replace the malfunctioning location, then go to the next step.
		No	Replace the PCV valve, then go to the next step. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
6	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting.(Explain repair contents to customer)
		No	Repeat the inspection from Step 1.

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