Unfortunately this car will be a write off. There are so many electrical components to the W140. These will need to be replaced. Fuel areas will be corrupted. The list of potential problems is too long to contemplate.

Even if you spend a lot of time and money trying to get the car going again it will never be reliable.

If you could find a " donor" car then making one car out of two may be feasible.


For your info. During the early eighties a ship carrying a load of Mercedes was sunk off the Malacca strait. Some enterprising soles salvaged a bunch of these cars and " repaired" them. There were new W126's and W123's.
They only lasted a few years - the rust got to them very quickly. The W126's and W123's are "simple" technology compared to a W140 - even a simpler model such as the S280.

Top Gear U.K. submerged a diesel engined Toyota Hilux in the sea during one of their torture tests. They managed to get this car going again. Mind you the also set fire to it, shot at it with a tank cannon and then put it on top of a ten story building which the destroyed by implosion. - The Toyota still ran.

Mind you watch these videos.

http://www.youtube.com/watch?v=-bIV_hHPAFQ

http://www.youtube.com/watch?v=tRKhKKdXIl4&feature=related

http://www.youtube.com/watch?v=dn19Qj5jtf4&feature=related

http://www.youtube.com/watch?v=kTedyrdAzV0&feature=related