The value is what you place on the car, then the value of what it is worth to someone else.
If this MB is just a stepping stone onto other vehicles, then just drive it.
Replacing a water pump, Glow Plugs, Injectors, valve adjustment or what ever, doesn`t cause the value to increase. these are just maintenance items that go along with car owner ship.
Going to college W/O the MB?

Blasphemy

. then what? the Honda?
Well there probably won`t be much time for a MB with the party time in college
Just kidding, JK.......JK......JK......
Charlie