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My friend just bought a boat with a 2010 DF90A with 1220 hours. It ran fine the first time he used it. The next time he took it out it seemed like it had a slight miss on one cylinder. When we changed the oil it was very milky, pretty much tan colored. He also managed to break off half of the spark plug threads on the top cylinder. I was wondering what would be the most likely culprit of the water intrusion. And also how bad of a job it will be to tear the motor down. I have purchased the service manual for it as well.