Vapor separator tank/fuel reservoir 1999 vp 5.0gipwtr tbi

[bannditt]

I noticed that the vapor separator has a hose from the thermostat housing through the tank fuel reservoir and back into the exhaust manifold I was wondering if not winterized properly if the tank could somehow be compromised or cracked and therefore put moisture into the fuel and eventually moisture into the oil,1999 Volvo penta 5.0 gi TBI 350 hrs.it’s a1999 glastron gs 249 ran great all summer,at the end of the season I noticed water in oil(not a lot midrange on oil stick) I have done two oil changes along with two filters and fog the engine,drained it today,and gravity fed antifreeze.Weather permitting I will pull the spark plugs and take a look at them tomorrow