1996 GMC C3500 Oil pressure dropping

Tiny
HITMAN2010
  • MEMBER
  • 1996 GMC C3500
  • V8
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
I have a 96 GMC 1 ton with a 454 BBC. At start up, it idles with great oil pressure (about 60-70 psi) and after 15-20 minutes, the oil pressure drops to 10-15 psi. I don't hear any real knocking at the low end or any valve clatter while using a stethoscope. I am suspecting bearing clearances, but with the stethoscope, I hear noises in the oil pump that sound like a power steering pump going south when you turn the wheels. After 20-25 minutes, the "check gauge" light starts flickering and the oil pressure is almost non registering. Can I buy some time with Restore and maybe a higher viscosity oil as pulling the motor right now is not real viable financially?
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Monday, May 10th, 2010 AT 10:11 PM

1 Reply

Tiny
2CEXPT
  • MEMBER
Why don't you actually check the oil pressure with a mechanical gauge and find out what's happening with the pressure -pressure relief valve could be sticking
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Wednesday, May 12th, 2010 AT 5:57 AM

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