You may also try searching the archives for M103, which is the engine you have. In the U.S., 86-92 300E's also shared the same engine as in your W126. There are probably thousands of posts with questions relating to your engine.
You can spend more time reading these posts than sleeping, so be careful!
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".