How bad is it to have too much oil in your motor? I recently changed my oil myself for the first time, and only about half a gallon of oil drained. I put in the recomended 4.2 quarts of oil, and now the oil level seems to be kinda high on the dipstick. The car runs and drives the same as it did before. I just don't want to keep driving like that if it's gonna hurt anything. Any input is appreciated.