Oil Consumption Diagnosis. Pontiac Firebird 1998

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1998 🢒 Firebird 🢒 Engine 🢒 Engine Controls - 5.7L 🢒 Oil Consumption Diagnosis

Checks

Causes

DEFINITION: Excessive oil consumption, not due to leaks, is the use of 0.95 liters (1.0 qt) or more of engine oil within 2 414 kilometers (1,500 miles).

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 of 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 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