There's a relationship – and it's a clue, I hope (as I'm not an expert on these various factory relationships).
"Rasmussens DKW engine was a simple, but effective design, with very few moving parts, which powered his motorcycles from 1919. By 1929 DKW was the world's largest motorcycle manufacturer. The same basic engine design was adapted for the DKW and Auto Union cars and later also for SAAB and Trabant."
"DKW - Das Kleine Wunder (The small wonder). The German carmaker's pre-war type F8 became the archetype of all East German family cars...."
"DKW, which the Trabant engine is based on, says that their engines last longer when they drive on 4-stroke motor oil. Though it will smell HORRIBLE!"
"the DKW F8/F9, previously produced also by Trabant)"
The "P-601" was an example of extreme essentiality:
no valves,
no camshaft,
no timing belt,
no oil pump,
no water pump,
no radiator !
BTW. In case this introduces confusion, the answer is nothing to do with DKW. Mike is close. Now I'm throwing points away.