Engine - Increased Oil Conslimption

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Bulletin
88-6-28

Date
Dec., '88

Ref. No.
88-261-6

Corp. Ref. No.
836114R


SUBJECT:
INCREASED OIL CONSLIMPTION


MODELS AFFECTED:
1988 CENTURYS WITH 2.5L ENGINES (VIN CODE R)
1988 SKYLARKS WITH 2.5L ENGINES (VIN CODE U)


Some customer comments may be received regarding increased engine oil consumption. "Increased" oil consumption may be defined as approximately 200 miles per quart or less. Light blue colored exhaust smoke may or may not be evident in these cases due to the catalytic converter's exhaust gas processing.

This oil consumption condition may be caused by one or more suspect intake valve stem seals.

IMPORTANT:
It is recommended that intake valve stem seal inspection be performed first in diagnosing reported cases of increased engine oil consumption.





An inspection of the valve stem seal of one cylinder will reveal if the seal is in fact suspected. The suspect seal(s) can be identified by a cutout section on the top portion of the seal, (See Illustration). Valve spring removal is required to properly inspect the seal. If the seal is identified as suspect, all intake valve stem seals must be replaced with Part Number 10042875. Refer to Section 6A1 of the Service Manual for details on seal servicing.

If the intake valve stem seal inspection for one cylinder does not reveal a suspect seal, then the cause of the increased oil consumption is in some other area of the engine.

Use applicable labor operation and time, per the Labor Time Guide.