Under the terms of Nazi economy and the German re-armament the authorities ordered the construction of the Opelwerk Brandenburg facilities in 1935, where until 1944 more than 130,000 Blitz trucks and chassis were produced. The medium-weight versions originally were equipped with a flathead 68 HP petrol engine coming from the 1930 GM Buick Marquette, replaced in 1937 with a modern overhead valve 75 HP straight-six engine also used in Opel Admiral passenger cars. This engine was very similar to Chevrolet engines from the same period, to the point that disabled Blitzes abandoned by fleeing Germans could be easily put back into operation by advancing Allies using Chevy/GMC and Bedford parts.