04 Cat C12 Oil Pan Leak

Hello again with my dumb questions as I'm a new owner operator with my first truck I'm trying to get up and running. 04 freightliner with a Cat C12 oil pan has oil and grime caked on all over it. Would this be as simple as me replacing the oil pan gasket? I don't see any oil leaks above it coming from the engine as far as I can tell. Noticed all this while I was underneath changing the oil today.

 

Thank you. That will be my next task then when it comes time for the next oil change. And yeah I just learned of the spout today. I made a huge mess with that drain plug and took about 45 mins to get it off! Never again

 

This is the first I'm learning about a bridge engine. I'll have to see when exactly mine was made. Hopefully the later part of 04. But the thing runs great and idles very smooth. Only bad thing so far is it has a governor that limits the rpms while shifting..basically keeps rpms super low which threw me off so I'll have to see how to remove that. She runs good though but have yet to put a load on it. And I plan on cleaning that oil pan off at the car wash for sure.