C3 of 2014 3001 / ASM

Hey together, when the oil was poured, a serious mistake was made on my part with the car of the girlfriend. Oil cover was forgotten to make it again. Has now about 100 KM driven, today it is only noticed, because on oil drops under the car was pointed out, first colleague from fire department called for binding and coarsely cleaned everything.. seems to be over over the lima etc., car saws now immensely in empty run, whistles / saws, shortly before going out. when driving no noticeable kei t but at traffic lights / idle just before running out and saws between 700 u/min and 1500 u/min (saws) are now close before the car to drive off, since previously already there were problems with higher oil consumption etc. (hence also the filling of the oil + forget the oil cover..) someone an idea where you can look for yourself? before you push it off, since a repair would not be worthwhile any more?