Oil change warning is on but mileage doesn't line up with oil change tag?

What is your question?

I had it checked by an oil change shop. Their findings- is that I have a bottem oil leak and need to replace the oil pan and gasket. By having this repair would it address the engine knocking at lower speeds and the rpms jumping up and down? I was also warned that the engine knocking was an early sign for transmission failure. I'm also at 191,000 miles. Sucks only had the truck for 2 weeks. Purchased as is.

What makes this problem better or worse?

The knocking usually occurs just moments from startup

How long has your 2011 Ford Flex had this problem?

It has been happening more frequently since last week