I recently changed my oil and filter....and the next day noticed an oil spot under the front of the car. I double checked the filter tightness and sprayed/cleaned off the bottom of the car to be sure it wasnt old oil dripping down. I stupidly forgot about the crush washer on the oil drain plug....it either needs to be flipped (only once of course) or replaced with every oil change. I thought i would share my stupid mistake with all of you so no one else here would run into the same problem!!!