Originally Posted by mk378
And, three pages later, the OP discovers it's only half full of coolant?
Consuming a half gallon of coolant in 300 miles is less than ideal. But that explains the constant overheating. The head is cracked and its pushing it into the oil. These run warm,enough that it usually evaporates off most of the water out of the oil, so they won't milkshake the oil cap