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15 seems low. Ford gives a spec of 40-70 psi with the engine speed @ 2500 rpm engine hot. Most cars I see are around the 25 psi @ idle. If your idle is lower than it should be it will make your pressure lower. This should be a direct reading on a good mechnical engine oil pressure gauge.
I would want to know what the actual oil pressure is. The sending unit or the gauge on the dash could have failed.
There is a pressure relief valve to prevent oil pressure from going too high, but staying at 80psi would not be good for a long time.
Usually two reasons why oil pressure drops over time,worn engine parts,old oil.Try an oil change with new filter I sometimes use an additive like Restore.Over time the oil will become thinner and less viscous leading to a drop in oil pressure.
According to their website the minimum oil pressure is 41 psi at idle. I'd suggest verifying the oil pressure with a manual gauge directly plumbed to the engine. If it is 17 psi when the engine is up to temp. then you may have issues with the bearings. You should take an oil sample and find out what the metal levels are in your oil to determine if the bearings are going
Are you sure the gauge is reading correct? You also didn't mention how many miles the vehicle has. If it's less than 150k I would doubt the motor it worn out, (excessive bearing clearance would cause poor oil pressure even with high volume pump). Chevy's have a lot of issues in the dash with the motors that make the individual gauges work. I would check the oil pressure with a manual gauge. If you don't have the skills to do this yourself, a qualified shop wouldn't charge much to do it. If you find that the gauge is incorrect, there is a guy in MN that rebuilds the instrument cluster for $65 with all new stepper motors (the motors that work the gauges) and replacement of all the bulbs, plus gives it a lifetime guarantee. www.speedometerrepairguy.com.
That is normal, many vehicle normal pressure is 50 psi and minimum is 15. The pressure you have is good,Its high but good,some high oil pressure will cause the lifter to solidify and then a misfire will occur, and again this is very rare.many oil pump in yester year car was driven by a worm gear attatch to a distributor, and it is still but without the distributor. So the oil pump is driven the same way and is monitored by the oil pressure sensor,(when oil pressure is low the light will go off then you would know you got a problem). The faster the car is driven the more lubrication its going to need so the oil is buid up at the same time engine demands are high. You dont have anything to worry about enjoy the car come on its a Corvette. Just make sure the level is good and change when its needed.
Your oil pump is driven by the camshaft. When you step down on the gas, the engine (and of course the cam) turns faster, turning the pump faster, therefore making higher oil pressure. 80psi is good but a bit on the high side (depends on actual RPM though) You will always see a higher pressure on start up especially in cold weather. Most times it will drop a bit after the oil warms up. Most oil filters (good ones) have a burst capacity of about 120psi so I wouldn't worry about it. If you run a synthetic oil you may see slightly lower pressure but will not loose any wear protection. Additionally the synthetics tend to keep oil passages cleaner and will gently remove any restrictions that formed due to gunk buildup.
Start up with the engine cold, should be 60-65 psi
Start up with engine hot and also running in gear idling 42-48psi
Any other readings could be a bad oil pressure sending unit or a oil pressure relieve valve which is located on the block where the remote oil line is bolted to. Good luck and keep me posted.