Hi all,,,I have a 2000 gen3 statesman that has lost oil pressure,,,it started 12 months ago but would come good if you turned it off then on again,,but lately I cannot get out the driveway,,the cam followers get noisey then the oil light comes on,,,I have flushed the motor and changed the oil {10-30) new filter ,,,the old oil was 6000k old,,196000k total,,,motor was done under warranty for piston slap at about 45000k,,,would it be the oil relief valve and can these be done without taking out the motor,,any suggestions greatly appreciated,,cheers john