Me and my bro changed the head gasket in his cally t. We started it up and and it was ok, we even took it for a drive up the road.
About an hour later he changed the oil and filter using vauxhall semi synthetic filling it to the max mark and took it out for a run again. Everything seems ok.
He goes back to the car later starts it up and the top end is rattling really bad. It seems that there is no oil getting to the top end and the oil pressure light is lit up.