Hi. This will indicate that there may be some sludge build up in the block, or the oil pressure switch may be damaged. The more serious issue will be a failing oil pump. To isolate the issue, simply, have a oil pressure test ran on this engine. If the test indicates that the true oil pressure is optimal at idle, kindly replace the oil pressure switch. Now, if the test proves that the pressure is indeed lower than factory specifications, this will confirm that the pump is damaged. Have the pump, and oil pump screen replaced, in this case.
NOTE_ I would, also, recommend to have the engine flushed asap.
Mine did the same thing and my oil was way low so I put oil in and it stopped.
More than likely bad gauge BUT dont count on it buy an aftermarket oil pressure gauge and hook it up if u read good oil presure now nothing to worry about but if new gauge fluctuates too u more than likely have bad oil pump posiabley bad bearings if it does have low oil pressure do not drive it u will destroy the motor quickly
Sooner u find out this problem the better
But as a said more than likely just bad gauge but dont count on it check it out
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