Engine - Excessively High Oil Consumption: Overview

90ford01

Article No. 90-1-9

OIL CONSUMPTION - 5.0L EFI ENGINES - SERVICE INFORMATION

FORD: 1987-88 THUNDERBIRD 1987-90 CROWN VICTORIA, MUSTANG

LINCOLN-MERCURY: 1987 CONTINENTAL 1987-88 COUGAR 1987-90 GRAND MARQUIS, MARK VII, TOWN CAR

LIGHT TRUCK: 1987-90 BRONCO, E-150, E-250, F-150, F-250

ISSUE: Excessive oil consumption on 5.0L EFI engines may be caused by one or more of the following:

^ Oil leaks from gaskets

^ Poor sealing of the lower intake manifold

^ Intake and exhaust valve stem seals

^ Piston rings




ACTION: Perform an inspection and oil consumption test as described in the following service procedure to determine if an excessive oil consumption condition exists. If an excessive oil consumption condition is present, install new guide mounted valve stem seals for a more positive fit and new piston rings with improved oil control. Refer to the following procedure for service installation details.