Just looked again at my old book, it looks like there is a bracket mounted at the level of the sump to block joint also a small bracket welded to the vent pipe, through which there is a nut and bolt fixing between both brackets holding the pipe in place.. It seems the air flow through the filler cap and out through the breather is encouraged by venturi effect (?) caused by either the engine fan and/or when the car it`s self is being driven....
I guess it is possible if there is crankcase pressure build up, then there may be some blockage but it would seem to be a very simple system to be blocked up enough to cause a build up of pressure to blow oil out of the dipstick hole..?
