Oil pressure drops after it gets warm

By the way truck has 253,536 miles on it it is a 1500 and has pulled a 20 foot box trailer with bread in it. The owner owns a bread route this truck has been pulling that trailer since day one. I am a ford technician. I don't have very much dealings with chevy so that's why I am asking I willing to bet it's going to be a bearing worn allowing oil pressure to drop. Just thought I would check with others before selling a motor.

Worn engine.

I third the motion.

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.