Low Oil Pressure

Jackmroz

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May 9, 2017
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Central Wisconsin
Greetings,

I have a 2008 GMC 2500HD 4X4 pickup with the 6.0 gas engine. The truck has over 194K miles on it. I use Mobil 1 synthetic oil religiously. As of late I noticed that the oil pressure gage has indicated a oil pressure of just under 40 while at moving speeds. When the truck comes to idle the pressure drops to under the 20 mark on the gage. The truck does not use oil at all but I'm concerned about the falling oil pressure. Anyone have any ideas why this is happening? :confused:
 
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