75 oil water mixed on sitting car

Either someone put water in the oil or it sat out in the rain with a leak that led to inside the engine or you have a massive amount of condensation in the engine. I think you need to park the car under cover.

That's an air-cooled engine, no water in it unless it's rainwater. Water from the tailpipes is normal cold-start condensation.

Rainwater: I've a Karmann Ghia with a 1600 engine which has just taken in water. Heavy rain entered through the engine vents in the boot lid. It dripped onto the top of the air intake cover then down the sides and through the foam dust filter. The carburettor itself then acted as a funnel, directing water straight into the cylinders. Car wouldn't start, obviously, but after enough time/turning the water carried on through the valves into the exhaust. On firing, up to 2 litres of water shot out of the tailpipes. My problems occurred overnight in torrential rain; yours probably allowed a slow leak past the piston rings into the oil itself.