Germans used petrol, which was problematic. Dieles engines use glow plugs, which meant you could relatively warm up the engine that way, not to mention the t34 had air compression starters which would get the fuel moving, and they sometimes had preheaters, the Germans had neither, and used a fuel that was bad for the winter, but the cold wasn't a problem because of the fuel, well, it was, but it was a big problem because batteries suck in the cold, and if I remember right, half of the battery's job on the panzer carients in Stalingrad (pz3s n shit) was radio communication, and this was a huge issue, because Stalingrad was basically a giant heap of building materials, so you had tanks that couldn't communicate, if they could even start via kaltstart techniques previously mentioned, in a pile of city which was more or less untraversable.
