Any fuel was in short supply in 1945 Germany and priority for diesel was given to the U-boat arm of the Kreigsmarine. Furthermore all fuel was strictly rationed and civilians would be mostly unable to obtain either petrol or diesel.

The German military was drastically hampered by it's fuel shortages during the war. Germany had very little domestic oil production. It relied on minimal supplies from Romania and synthetic fuel made from coal by expensive chemical processes.

Moreover, the German army's trucks, tanks and automobiles overwhelmingly, if not totally, ran on petrol (aka gasoline), as did every major power except the Russians, who used some diesel powered military vehicles.

Any diesel produced or imported in German at the end of the war would have been allocated to u-boats, which used diesel engines. Even running the u-boat arm was difficult at times due to the fuel situation.

German railways used mainly steam engines that ran on coal. Some diesel locomotives did exist but were only occasionally used due to the fuel situation.

So there is pretty much no diesel available in most of Germany. The most available type would be whatever u-boats and diesel locomotives used, but I don't have any information on what type that is.