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Originally Posted by HarryM
<< The only thing you can be sure of is D >>
Not always. The D in the 300D of the 1950's was for Diplomatic. It was a gasoline model.
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The W189 is a 300d where the lower case d implies the fourth revision of the original 300, which is actually a W186. The badge on a W186 or W189 reads only 300. There is no d or D suffix. There may have been diplomatic versions of these cars but I'll bet my neighbor's cats that they don't have a D as part of the badge either.
If anything, the 1954 300SL was the first production MB with fuel injection so it should have been a 300SLE

The first MB to bear an E for fuel injection is the 1958 220SE.
Sixto
95 S420
87 300SDL