Lemme start off with the basics; I have 170k on my 4.6l bird, uses 1 quart of oil between oil changes, lose a little bit of coolant between oil changes. Today when checking the oil it looked clumpy like it was cooked. Now last night the car overheated, and it's due for an oil change. I have noticed no problems in drivability. Is it possible that the over heating 'cooked' the oil dirty oil?