MILKY OIL

1999 CHEVROLET TRUCK
180,000 MILES • V8 • 4WD • AUTOMATIC
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MIRACLEB
  • MEMBER
  • 1 POST
which lines hook up where on an oil cooler unit for a 1999 chevrolet z71 350 5.7 liter. I had oil in my radiator and no oil in my motor, I switched the lines, now I have no antifreeze and milky colored oil, which is 5 qts over full.
Jan 14, 2011 at 3:34 PM
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ERNEST CLARK
  • ✓Experienced Mechanic
  • 1,730 POSTS
I believe your truck uses an internal reservoir that's part of the radiator for an oil cooler. If this is correct, then your oil cooler lines run from the oil filter adapter at the engine to the driver side of the radiator.

I've seen instances where the radiator would develop an internal crack and allow the oil to mix with the coolant. Because the oil system builds up much more pressure than cooling system, the oil sprays into the coolant. But if you had the lines reversed, then the suction side of the oil pump would draw coolant into the oil.
Feb 25, 2011 at 5:31 AM
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