97 Cadillac Deville/4.6L Northstar

I want to replace the oil pan seal and gasket. Can this be done without taking the engine out?

Is it leaking? The common leak is the case half seal, which is above the oil pan. And yes, I believe that can all be done with the engine in the car.

Yes it's leaking. Not very fast. I currently have it jacked up to where it's leaning toward to the drivers side and it leaks more toward that side being jacked up. I had it jacked up to where it was leaning toward the passenger side and it didn't leak. Long story short, I didn't know if the job could be done without removing the engine.