both the D and SDL's are 4 doors. the only 2 door diesel i think is the 300CD. the 300D is on a W123 chassis and it is a E-class with a diesel engine. the s-class is on a longer W126 chassis. i think the S-class has a lot more options and interior stuff because it is an S-Class. but have not driven a W123 my self i can't say about the hadleing, ofcourse everybody will have their own opinion. but the S-Class is heavier.

and i think both these mercedes are pretty safe in collisions. safe being totaling the other car, and coming out with minor damage.

i own a 300SD, and the 300D is just too small for me.

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05