How long do y\'all wait for your oil to drain? I just changed the oil in my burb and only got like 2 1/2 quarts out. I ran it for a minute then checked and the level was at the end of "operating" on the dipstick. I let it drain for about 10 minutes then took the filter off and drained for another 5 minutes. After it just dripped for awhile I stopped. Did I not wait long enough?