I have a 2014 Silverado, and I’m not sure when it started, but I recently noticed that the oil pressure while driving is around 40, and when I come to a stop (idle) it drops to around 25. I carried to the shop and they told me that this normal. Has anyone else had this problem?

 

Welcome from Florida. My 2013 is about the same.

 

This is pretty much ,normal.
What grade of oil are you presently running in the engine?

 

I use 0w-20 mobil1 and Mobil oil filter

 

If your oil is at correct level check the oil sensor. I have a 13 and had the same things happening until it totally went. My pressure dropped to 0 and I freaked. After some trouble shooting and thinking it through I figured it was the sensor. Not very expensive but dam hard to get to. Its on the center of engine by the fire wall down halfway above drive shaft. Prices I got were from 380 (Goodyear) to over 600 (Tire Kingdom). If you can reach it you can do it. I have a mobility issue. I had the auto hobby shop on a military base fix it for 140.00.