possible head gasket failure - it smokes white smoke from cold (does clear up when warm though) and the water level has dropped slighty (but not much). However, there are no signs of mixing, either water in the oil, or vice versa, the car doesn't overheat (no matter how long it's standing running for) and it still drives fine, It's only done it in the last couple of days, but i can't see it being anything else, but again, it still drives fine, and displays none of the other symptons normally associated with head gasket leakage?