It seems that everytime I have a dealer or shop change my oil, they overfill by ~0.5quart. On the dipstick, for example, the oil went past the upper boundary by ~3/4". How bad is this? I've read that it can cause foaming of the oil, but is 1/2 quart really going to do that? What can I do to remove some excess oil without getting under the car to drain it?