Sprinter 906 316 2013 purchased… Engine damage? Please help diagnostics and way to restore…

I bought a super nice thing today… with engine damage. Cars with fantastically good substance and a total brilliant device…just engine damage. You can derive a lot from the video n bitl what…? Is perfectly jumped, according to the previous owner in the neighboring village suddenly was funny in the running operation. Shake like pig. No engine control lights. Only otherwise noticeable that from the exhaust when the pipes MSD from ESD transition oily or this is so sucking out and this looks quite new…Otherwise from below dry… Meaningful to think right in the direction of ATM? In which direction do you value???