Express 1/2 Ton Van V8-305 5.0L VIN M SFI (1998)
Engine Oil: Symptom Related Diagnostic Procedures
Oil Consumption Diagnosis
Excessive oil consumption (not due to leaks) is the use of 1.9 liters (2 quarts) of engine oil within 3200 kilometers (2,000 miles). However, during
initial engine break-in periods 48286 - 6437 kilometers (3,000 - 4,000 miles) oil consumption may exceed 1.9 liters (2 quarts) or more. The causes
of excessive oil consumption include the following conditions:
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External oil leaks. Tighten the bolts and/or replace gaskets and oil seals as necessary.
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Incorrect oil level or improper reading of oil level indicator. With the vehicle on a level surface, allow adequate drain down time and check for the
correct oil level.
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Improper oil viscosity. Use recommended SAE viscosity for the prevailing temperatures.
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Continuous high speed driving and/or severe usage.
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Crankcase ventilation system restrictions or malfunctioning components.
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Valve guides and/or valve stem oil seals worn, damaged, or the seal omitted. Ream the valve guides and install oversize service valves and/or new
valve stem oil seals.
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Piston rings broken, improperly installed, worn, or not seated properly. Allow adequate time for the piston rings to seat. Replace broken or worn
piston rings as necessary.
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Piston improperly installed or miss-fitted.
Oil Leak Diagnosis
Part One
