Oil pressure drops after it gets warm
Asked by Fordf650 Feb 02, 2021 at 10:01 PM about the 2011 Chevrolet Silverado 1500 LTZ Crew Cab 4WD
Question type: Maintenance & Repair
Replaced oil pump oil pressure sensor and the filter even
removed filter still the truck starts cold with 35-40 psi and
drops to 1-5 psi after it runs about 20 min. I have checked
with manual gauge. What else could cause the problem
before I replace the motor.
2 Answers
If this is a higher mileage vehicle you're probably looking at the first symptoms of worn bearings. Hope that helps! Jim
Guru9WG2S7 answered 3 years ago
Short answer: acdelco oil filter 12706595 Now the rest of the story: this a $7 filter made for the corvette. I have a 2009 Silverado 5.3 with the dreaded afm. As soon as my truck would get up to temp the pressure would drop out to nothing. I changed out the oil pump, the o-ring, and the oil pressure sending unit (4 times). I finally called my awesome mechanic to see about an engine swap and he told me to try this first. I could not believe it, it totally works. Now my truck starts out at around 45 psi at start up and after it warms up it stays around 40 at 2000rpm and goes down to 20psi at idle. Can drive all day no problems. I don’t know the why or how but for $7 you have to give it a shot! And then spread the word!! Make sure to respond to this so others know it’s real and works.