checked the radiator coolant level this morning (after 2 weeks of occasional high-rev driving) and it seems to have dropped, similiarly to the reservoir level ie. about 1cm below the MAX line. fyi, my E4 radiator is newly replaced and no sign of leakage/coolant stain undercarriage. is this normal, i mean the coolant level goes down after some serious driving for few days?! otherwise, what could be wrong?! i've been checking the temp gauge every once and then (while driving) and looks fine tho' ie. 1 notch below mid point.