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That is pretty normal for most cars but it shouldn't fluctuate too much. The oil pump is controlled by the engine rotating. Spin the engine faster and the pressure will increase. If you feel there is a problem, Connect a manual gauge and check it against the manufactures specifications.
What do you mean by rear heat? What kind of a vehicle is this?
They are designed to change as the motor changes speed. If you have 80 lbs. of oil pressure than you have very good oil pressure in your engine. If it gets higher than 80, I would talk to service dept. at your local dealer.
First thing you need to do is have the actual pressure verified by attaching a mechanical oil pressure gauge in place of the sending unit on your engine. If the gauge verifies your dash readings then you have an oil pressure loss inside the engine that needs further diagnosis (worn bearings, obstructed pump pickup etc). If pressure drops enough to turn the light on I would not drive it 'till you know exactly what's happening inside or you can and will have an engine failure. One warning...if after you remove the pan, you find that the pump screen is not obstructed, Don't blame the pump for the low pressure.....check the bearings. However, regardless of what you find (obstruction or worn bearings) it is advisable to replace the pump. Pumps generally don't fail but ingesting debris (carbon or metal from bearings) will either score or wear the pump housing and vanes enough so that the pump will never reach full pressure. If the external gauge shows normal pressure, contrary to what the dash gauge tells you, blow out the sender passageway and replace the sender, then add marvel oil at each oil change as it will help dissolve any crud accumulated inside the oil system.
If I'm understanding you correctly your saying your oil pressure drops way down when you slow down and idle but the pressure is fair to good when your running at speed. If this is the case I'm afraid I have to give you bad news, it's most likely your main bearings are shot and you will need to have your engine overhauled or rebuilt.
A common problem is the pressure switch that is mounted on the camshaft position sensor on the left side of the engine while standing in front of the vehicle. This is the best thing that could be wrong and is most likely what is wrong. The worst thing is an internal pressure problem.
NORMAL JUMP AS THE ENGINE RPM INCREASES THE OIL PRESSURE GOES UP VERY FAST. I HAVE THE VAN, MY DOES THE SAME THING, U CAN TRY REPLACING THE OIL PRESSURE SENDER, BUT ONLY USE THE GM ORIG PART, AFTERMARKET ONES MAKE THE FLUCUATION WORSE..