have a 93 civic ex greddy turbo charge and just saturday after a head gasket replacement the oil light flickers or stays on at idle till you give it gas and the oil gauge reads zero. the car did have a history of low oil light comming on at one point. did a oil change with 4 qts and ran it for about 10 minutes but the oil dip stick still reads above the full level mark meaning no oil going to the oil filter and with a visual inspection everything looks good. there was no oil comming out of the old oil filter at all. any suggestion would help. and now im thinking of doing a engine crank case flush with the machine at my work place.