Low oil pressure on a 1996 olds Aurora

Hi, on my mom's car her low oil pressure alarm goes off when she is idel she can just be idel for 1 min sometimes it takes 10 mins for her alarm to go off.. she had had a number of oil changes including her
pump and such, but nothing seems to be working. she does use 5/30 for her oil. any help would help out thanks.
Mickey
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And the car is??

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read the subject line dude...
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Agreed, got numb brain for a moment, Dude?

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Have the oil pressure checked using a known accurate mechanical gage, may only be a sending unit problem not internal.

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