I recently purchased a coolant reservoir bottle since the old one had a crack and was dripping coolant, i flushed the coolant from the radiator as well. After refilling the coolant, i noted that the car started to misfire, and the temperature is going up. In addition, when the temperature rises, i stop the car and check the coolant level, every time i check after this happens, the coolant level drops a lot, i have to refill. After taking the car to a diagnostic garage, they couldn't find any problem using the diagnostic machine. But after checking the engine oil, they found it to be milky. Please advice what needs to be done, and if i can still fix the car and be using it.
My car has 245000 miles.
My car has an automatic transmission.
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