i have a mark 4 fiesta 1.3 jobby and i find that the filler cap gets a lot of white crapp in it, i first thought it was the head gasket but i an not loosing water from the expansion tank, when the enging is running and i pull of the filler cap there seems to be a lot of condensation, also comming from the exhaust, is this the norm or is it fck`t , i was also thinking could it have been the wrong oil that i used 15/30w?

help plz

much appreciated.