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Engine oil pressure tends to be higher when everything is cold and should steadily fall to a normal value when hot which can be very low at idle but should reach the required pressure at about 2000/2500 rpm.
In theory the faster the engine turns the greater will be the oil pressure and this should be avoided as abnormally high oil pressure can harm the engine. In order to prevent this happening there is a spring loaded valve that will begin to open at a predetermined oil pressure and return surplus oil to the oil pan, therefore regulating the maximum pressure.
In cases where the oil pressure is higher than the usual hot reading but lower than the usual cold reading it could indicate the engine is being overcooled due to (possibly) a thermostat fault or similar.
If the pressure is abnormally high, higher than the usual cold reading, it indicates a fault such as a blocked oil filter, a partially blocked main oil gallery or a faulty pressure relief valve.
It is important such a fault should be investigated and corrected quickly without driving the car very far or fast and preferably not driving it at all because such a blockage, if it is a blockage, is likely to be causing oil starvation to an important part of the engine.
Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts
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.
A high oil pressure reading is a good thing, low oil pressure is something to worry about. Normally with a cold start, your oil pressure will remain high until the engine has reached operating temperature, then drop a bit, but again, high oil pressure readings are a good sign of a healthy engine. One other factor to consider is the viscosity of your oil, if your engine uses 5w30 and you switch it to a higher viscosity such as 10w40, you may also see higher oil pressure readings, so be sure you are using the correct oil for your vehicle. I hope this has helped you! :)
It is normal for the oil pressure fluctuate. this is caused by the oil pump not turning as fsst and pushing less oil. When the pressure starts to dip really low it is cause by the bearing wearing out and not holding the pressure. bearings normally wear out for two reasons, one is that it really high miles on the engine, the other is running it to low no engine oil. If you don't have really high miles , then I would look at the oil sending unit first. they can get clooged up and give bad readings.
The oil pressure will not always stay steady.When the oil gets hot it will read lower and higher with the RPM's.Pressures will read higher when you first start the engine then drop the hotter it gets.If it has not always been this way you may have a oil pressure sending unit going bad.
This sounds normal to me! The engine will read that rpm when accerlerating lightly. It is the stall of the torque convertor. The oil pressure will always be higher when the rpm's are higher, or when the oil is thicker - cold.
Virbration? That is a different story. Oil won't cause that.