Ran over median

It is hard to know where the exhaust crack is but if it is loud now then there is a crack before the muffler or the muffler itself.

https://www.2carpros.com/articles/exhaust-system-removal

As for the oil leak, here is a guide that will help with this:

https://www.2carpros.com/articles/engine-is-leaking-oil

We need to get a general location of where the leak is and then that will tell us better where the leak is.

Please run through this material and then if you can get some pictures of the exhaust and where the oil leak is, we can better assist with what we need to do. Thanks