At the moment, with the pancake air filter on the carb and the tiny one on the oil breather, there's nothing switching between hot and cold air anyway so if it stops oil spraying all round the engine bay it will do as a temporary fix. At the moment, oil mist is condensing on the tiny breather filter, then dripping down right in front of the fan outlet that doesn't have a pipe on it because the PO got rid of the heat exchangers and fitted J tubes. Then it gets blown all over the place. " The oil filler in stock that you show is also the older type that doesnt have a negative pressure breather setup.. The one you wanted connects to a breather inlet on the correct air cleaner downstream of a weighted flap." Is that the oil breather or the fuel tank? Do you know the part numbers for the correct set-up? I've tried googling it but all I've found is the one I've shown being listed for all Bays and Karmann Ghia's.