Question about 1999 Ford Taurus
Thick black oil generally does not indicate coolant in oil...that appears as coffee coloured residue with a milkshake thickness to it. But, I'd let the car stand overnight and then drain oil. coolant will stay at the bottom of the pan and exit first, so watch carefully.
Next, have a shop dye check for leaks...often small leaks are in the form of seepage that is light enough to evaporate on the hot engine before reaching the ground. Another test you can do is to let it sit overnight with the radiator cap off. Sometimes a water pump seal will only leak when not under pressure. (like when you try to empty a can of dog food...punch a hole in the bottom of the can and it will fall right out!) Also, check the rug inside the car...any dampness indicates a leaking heater core.
I hope at least one item here will help. Obviously if you are loosing coolant, it has to be going somewhere. PS: use a good grade of synthetic oil and it should not break down as quickly as what you are using (regardless of if contaminated or not)
Posted on Apr 20, 2009
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Posted on Jan 02, 2017
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