ENGINE DIVISION SERVICE MANUAL
CHART NO. 16
EXCESSIVE OIL CONSUMPTION
Verify the Condition
The most common cause of oil loss is leakage. To
verify an excessive oil consumption complaint, it is
necessary that a thorough inspection be made to insure
that leakage does not exist. The following steps should
be followed to verify an excessive oil consumption
Steam clean the engine (if necessary) to remove
accumulated dirt and/or oil.
Drain engine oil and change the oil filter.
Fill the crankcase with the specified amount of
the recommended grade of oil. (Check to be sure
the correct dipstick has been installed. )
Check positive crankcase ventilation system for
excessive oil pullover into air cleaner.
Drive the vehicle under normal conditions until
the engine is at normal operating temperature.
With the vehicle parked on a level surface, place
a clean paper under the engine (to aid in
Shut off engine and check for leakage at:
Valve rocker arm cover gaskets.
Oil pan gasket.
Cylinder block front cover gasket.
Cylinder block-to-fuel pump gasket and
fuel pump air vent.
Intake manifold seals or valley cover
Distributor housing gasket.
Oil pressure sending unit.
When all causes of leakage (if any) have been
repaired, check the oil level and adjust oil level to
full mark on dipstick.
Record the odometer reading.
customer operate the engine for the approximate
number of miles indicated by the complaint and
then return it to you for examination.
When customer returns the vehicle, verify the
odometer reading. Check the oil level and
reinspect the engine for signs of oil leakage.
Add a measured amount of oil as necessary to
bring the oil level to the full mark.
If oil consumption is not within specified limits
(400-500 miles per quart), proceed with oil
consumption diagnosis as outlined below.
NOTE: A new engine may require up to 6000
miles of operation in order to properly seat
(break in) the piston rings . For this reason, the
engine should not be condemned as long as oil
accumulation. If oil economy ceases to improve
with mileage accumulation, corrective action
should be taken.
CGES-215 Page 30
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