The oil pump o ring failure is a common issue on LS engines with age.

This includes the Chevy 5.3 and Chevy 6.0 along with Yukon, Escalade, Suburban, Silverado's, Sierras, etc.

This video is to demonstrate a way to change the o ring without necessitating dropping the oil pan.

The o ring is available here:

https://amzn.to/3xIFd9c