[Synchro909]

There is a mist of oil in the cranks case while the engine is running. It lubricates everything that is not positively lubricated, like cam shaft, cylinder walls etc. Worn piston rings or ring that have lost their tension (maybe over heated) and/or worn bores allow too much exhaust gas past them and into the crank case, forcing the oil mist out of the breather. That is why you get the oily film everywhere. One way of dealing with it is to feed it back into the inlet tract and burning it but that doesn't deal with the cause of the issue. That can only be dealt with by a new set of rings (after making sure the bore is parallel) or a rebore with new pistons and rings. The first option is somewhat temporary.