I have an '82 280zx (NA) and my oil pressure is pretty strange. My oil pressure wavers a lot. When I come to a stop, the pressure drops to zero then comes back up. When I floor it, it stays pretty steady at around 80 psi (K&N oil filter) but sometimes it drops pretty low, but the oil light never comes on, even when the gauge reads 0. The car also burns lots of oil, so its time for a rebuild, but I have good compression (180 all around). Just wondering if anyone has any ideas.