Coolant loss


#1

The engine is a w code, iron block, alum heads, two valve. I have not noticed any increase in oil volume and the oil is not off color. Ihave changed the oil twice in 2 months and each time when the drain plug is loosened I get maybe 10 to 20 drops of green coolant. When this stops I continue to remove the drain plug and the dirty oil begins to flow as normal. There is however a light brown milky film under the oil filler cap. Any and all comments are much appriciated. Thanks again. Sam


#2

Need more info about the engine. Year,make, model, miles.

If I were to guess, there is a intake manifold leak.


#3

If it’s a GM motor, it sounds like an intake gasket leak. An independent mechanic or dealership should be able to confirm the diagnosis. Coolant in the oil is a very bad thing, the coolant displaces the oil on the bearing surfaces. Coolant is a lousy lubricant.

Ed B.


#4

You can’t possibly get 10 or 20 drops of green coolant when you open the oil drain.


#5

mercury 4.6 v8 2002 mountaineer 103000 miles


#6

There are simple tests such as a pressure leakdown test to verify the cause. That test simply pressurizes each cylinder and checks to see if it holds the pressure. Failure to do so indicates a leak through the headgasket.

I’d recommend having this checked as soon as possible. This condition will cause further damage if unchecked.