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Home >> Ford >> 2004 >> Excursion 6.8 S, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Symptom Charts - CNG, Flex-Fuel & Gasoline >> Step 3: No DTC(s) Present Symptom Charts >> Chart 15

Chart 15

Oil System Concerns:

SYSTEM/COMPONENT REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE  ) unless noted 
PCV System GO to G: Positive Crankcase Ventilation (PCV) System STEP HG1.
Base Engine Engine System - Refer to the appropriate ENGINE article.
Additional Checks
  • External leaks
  • Proper dipstick
  • Proper oil viscosity
Visual