So, after having overheating problems which resolved by a alternator belt change, and tightening a rattling spark plug, the engine decided to give out.
Smoke is pouring out by the rocket cover seal, just above the filter, smells like a great deal of the oil has been burnt. The engine is very hard to crank and water is also dripping out somewhere.
When I say smoke, I mean the whole engine bay is full of smoke, it's coming out at the wheels and front grill. I thought the car had caught fire.
It would seem it is her time, at circa 675.000km. I will try and get the car to a mechanic, that is if it will even start ever again, dismantle the engine and see if there is any chance of saving the engine by replacing the head gasket and other seals, the water pump and maybe some valves.
This is a very sad day