Oil Consumption Diagnosis. Cadillac STS 2007

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Oil Consumption Diagnosis

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Causes

DEFINITION: Excessive oil consumption (not due to leaks) is the use of 0.946 liter (1 quart) or more of engine oil within 3 200 km (2,000 mi).

The causes of excessive oil consumption may include the following conditions:

Preliminary

•	External oil leaks

Refer to Oil Leak Diagnosis.

•	Incorrect oil level or improper reading of the oil level indicator

With the vehicle on a level surface, run the engine for a few minutes, allow adequate drain down time (2-3 minutes) and check for the correct engine oil level.

•	Improper oil viscosity

Refer to the vehicle owners manual and use the recommended SAE grade and viscosity for the prevailing temperatures.

•	Continuous high speed driving and/or severe usage

•	Crankcase ventilation system restrictions or malfunctioning components

•	Worn valve guides and/or valve stems

•	Worn, missing or improperly installed valve stem oil seals

•	Piston rings broken, worn, not seated properly

Allow adequate time for the rings to seat.

Replace worn piston rings as necessary.

•	Piston and rings improperly installed or miss-fitted to the cylinder bore