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Should a 2005 GMC Sierra oil pressure gauge go down at idle When the truck is running it registers at 50 but when you stop at a light it decreases to about 20?
Wiki User
∙ 14y ago
Oil pressure of 20 PSI at idle, 500 - 750 rpm, is well within specs for both a 5.7 & 6.o L gas engines.
Wiki User
∙ 14y ago
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