Boat Repair Questions? Ask a Marine Mechanic for Answers ASAP
Oil rising and being creamy color is a sign of water intrusion. This is mostly likely from a failed gasket. Either way the engine needs to be diagnosed by a mechanic as soon as possible. Having water in your oil for long will cause internal rust and will permanently damage the internals of the engine.
Most likely not the head gasket then.It's hard to determine without looking at it but possibly and exhaust gasket under the powerhead.