I am changing the oil in a Verado 250 4 stroke outboard. The motor holds 7 liters of oil but when I pulled the plug to drain, the oil went all over the floor missing the oil pan. I could see that the oil pan was not going to hold it all so I grabed a 5 gal bucket to catch the rest of the oil. The oil was very thin and I drained out about 3 gallons. Do you know what would cause that much gas to enter the oil sump?