MW50 -Secondary effects were cooling of the engine .

[OberstDanjeje]

I think this table is a bit wrong, if you read this page,at the table's end you will find this line (for the DB605ASM):

Das Triebwerk Daimler Benz DB 605 ASM entsprach dem Ausgangmuster
DB 605 AS, wurde jedoch im Gegensatz zu diesem Verbesserung der Start-
und Notleistung mit dem Sonderkraftstoff C 3 und zusätzlicher Wasser
Methanol-Einspritzung geflogen (MW 50).


Roughly it say:

The ASM is the sameas the AS but with improved Special Emergency power designed to run with C3 fuel and MW50

The same is for AM engine

Only the DB/DC engine colud use B4 or C3 fuel

DB/DC engine are the same with just a different setting, you can change this setting with simple screwdriver