My manual does not say anything regarding this. i just bought the car 3 months ago. Do I check it hot or cold? Also when I unscrew the cover there is a dipstick built into the cover. At the bottom it has a min hash mark with 20'c next to it. There is also more hash marks above this one and one of them also says minimum. The top hash mark says max and it has 80'c next to it.