I have recently purchased a boat that seems to have water in the oil. I checked the oil and it was high. I changed the oil and alot of water came out. I let it run for 30-40 mins and it runs fine. The oil level slightly came up when first ran, but didn't continue to come up. Drained the oil again and its milky white. I talked with a mechanic and he said that it should shoot white stuff out of the top of the motor if the block is cracked. Does anyone have any ideas as to what the problem is? If the block is cracked shouldn't the oil/water rise the longer it is running? Any help would be appreciative