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check oil level in sump. You may have to remove the sump to check for cracked oil pick up line . Check oil pump pressure regulator . replace oil filter as it may be blocked and dropping the oil straight back to the sump.
It needs to have the oil pressure manually tested with a mechanical pressure guage. If good oil pressure is found, you most likely have a bad sending unit.
Hello
The most commopn cause of this is that the oil pressure sending unit on the engine is defective, if the pressure drops to far the fuel pump is shut off.
check oil sending unit first. could be that it has failed and is sending a bad signal to the instruments. if it is the pump the engine has to be removed to change the pump.
There may be a loose wire or the gauge or sending unit may be going bad. The first thing I would do is to hook up a temporary oil pressure gauge, not using the old one at all. With this watch gauge while driving and see what readings you get. If the readings still jump around you have a pump that is getting weak and failing, If that is the case the pump should be replaced, but with high milage you may consider rebuilding the entire engine. If the readings stay normal start checking for a loose wire at gauge or sender. Then check sender, then gauge and replace as needed.
No problem with the oil pressure, the norm is between 40 to 60. Anything lower then 40 you have low oil pressure and anything above 60 then you have high oil pressure which is caused by a blockage in the system.
What is common is the oil pressure gage fluctuating for the first 200 miles if the oil pressure sending unit is getting worn. Good maintenance will keep the engine clean and running good but the oil pressure sending unit is inexpensive and easy to replace. Next time you do an oil change you can have them change the sending unit.
Good luck and hope this helps. You can pick up the sending unit at Auto Zone and most auto parts store and will have the step by step to replacing it. If you do attempt to replace it. make sure you DO NOT USE any Teflon tape or silicon on the threads, they are tapered and need a good ground to the engine for proper readings.
An oil pressure sending unit is really not an expensive item nor difficut to change . Probably the answer , sending units faulter frequently. Hope this helps
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