You're right. I forgot that the inline 6 was used in the W210 chassis in 1996 and 1997.
The inline 6 M104 engine is a great engine, and once the head gasket has been replaced with the updated version, it should be every bit as reliable as the V6.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".