Thread: 383 Oil Pressure Too High
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Old 03-27-2021, 12:21 AM   #8
gmc684x4
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Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
Re: 383 Oil Pressure Too High
Most gm factory roller cam engines are 5w30
20w50 is a diseil truck oil viscosity
I would change oil to 10w30 or 5w30 check oil pressure again and check that your guage is working correctly
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