Each day since the 31st, when I added BlueDevil Oil Stop Leak to my engine oil, I have tracked the oil leak. I drive 10-30 miles per day. End of each day, I slide a large cardboard sheet under the front end. In the morning I check to see if oil dripped onto the cardboard, circle and date the drips. Yesterday and today... no drips. After several days, the stuff *seems* to have stopped a steady oil leak. I'm in disbelief. But there it is.