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1999 Chevrolet Silverado 1500

Question: low oil pressure

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Roland, V8, Holly, MI, April 08, 2009, 19:44

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My oil pressure drops to 25 pounds after I drive for awhile. After I shut the engine off and let set over night, the pressure is good when I start it.
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• Best Answer
  Russ April 08, 2009, 21:43
  

   Master

  Here is the oil pressure spec for your Silverado -
  42 kPa (6 psig) minimum, at 1,000 RPM
  125 kPa (18 psig) minimum, at 2,000 RPM
  166 kPa (24 psig) minimum, at 4,000 RPM
  Depending on the engine rpm your oil pressure may not be to far off.
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  Roland, April 09, 2009, 08:30
  

   Rookie

  at 70 miles my gage usually reads between 50 & 60, but after I drive for awhile it drops between 20 & 30, and I get a knock on the drivers side of the engine.

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  Russ, April 10, 2009, 14:45
  

   Master

  That is not good. The knocking noise could be from a worn engine part with the worn part causing the loss of oil pressure. I would suggest you have a qualified technician listen to your warm engine. They may be able to give you some idea what is causing the knocking noise.
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  rockyj, June 13, 2010, 15:41
  

   Rookie

  take your valve covers off take a clotheshanger and clean your port holes out thay tend to clog
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  Visitor, August 02, 2010, 14:15

  on the oil pressure specification it a misprint called your chev. dealships it from 37psi-60psi
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• Answer #2

  Visitor, August 02, 2010, 14:17

  you need to replaced your oil pump unless you replace the oil sending unit. the specification for oil pressures is from 37-50psi
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