I have a 2015 Silverado with the 5.3l in our shop. 82k miles and the oil pump quit. Engine runs but makes quite the racket. I started looking for a replacement option for the engine. GM dealers cannot get them apparently.....seems crazy to me. Jasper will sell us one by 8/1 but doesn't come with any gaskets expect oil and timing cover it is $4,000 plus 32 hours labor...... That seems crazy to me I don't understand why labor calls for so much. I cannot believe the oil pump failed either it's all just a little crazy. The customer said he had routine oil changes. The truck is relatively clean and looks like he took care of it. Very sad situation for him. Even crazier than the Chevy dealer cannot get a 5.3l Chevy engine......the world is going down the tubes it seems. Crazy world we live in nowadays.