I'm not sure 1\2 an oil change would blow the head gaskets or crack the block in that short amount of time.I'm leaning towards what Dave thought,water freezing during storage.Did you roll the pwc over during your first two rides?IF so and it was not righted in the proper direction(mine is clockwise only),water can get into the moter and wreck havoc.If this wasn't the case did they winterize it for you?
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SIKSUKR
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