I was told that diesels are not the fastest for interior heat and after 3 Vermont winters driving my TDI and Cummins, I have gotten used to very slow cabin heat until the vehicle is fully warmed up especially the Cummins.
Now with the MB's I am getting noticeable heat within 5 minutes of startup when it is 30's outside. What a pleasure.
My question is , how does Mercedes do it. Do they have a different more efficient method of heat transfer or what?

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1981 240D 143k 4 spd manual -SOLD

2004 VW Jetta TDI 5 speed 300k -still driven daily