Recently my mk2 sporting been knocking/tapping when starting from cold. The cure I found was an oil change with decent oil put back in. The car has only done 17k and the oil was like tar(very black and thick) which my mate said looked as if it has never been changed even though Fiat have stamped my book on the first service and ticked the oil change box whereas on the second service which was 6k ago the oil change box aint been ticked. I put 10/40 oil in it by the way.