1989 Ford F150 mustard

1989 FORD F-150
68,000 MILES • 6 CYL • 4WD • AUTOMATIC
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JAMFEL151
  • MEMBER
  • 1 POST
in my truck when i remove the oil fill cap there is all this mustard green looking stuff all on the inside of the cap and around the neck of the oil fill hole and im puzzled about what it is?
Mar 13, 2009 at 12:46 PM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
sounds like you are getting a antifreeze in with the oil.

i would be checking for a blown headgasket/cracked block/ or cracked head.

if its not that i would suspect an issue with cracked intake manifold or a bad gasket on the intake manifold.
Mar 14, 2009 at 4:45 PM
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HELPING YOU
  • ✓Experienced Mechanic
  • 100 POSTS
It's only normal condensation - start to worry if it shows up on dipstick...
Mar 14, 2009 at 5:02 PM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
one way to see what it is if your daring, taste it. sweet its antifreeze. if it tastes like exhaust smells and gas its normal condensation.
Mar 14, 2009 at 5:07 PM
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