In the 1964 version, the lightning with a ring was used in a yellow rectangle, with the Opel writing below. The whole logo was again delimited by a black rectangle. The basic form and proportions of the Blitz logo has remained unchanged since the 1970 version, which made the lightning tails shorter so that the logo could fit proportionately within a yellow square, meaning it could be displayed next to the 'blue square' General Motors logo. In the mid 1970s, the Vauxhall "Griffin" logo was, in turn, resized and displayed within a corresponding red square, so that all three logos could be displayed together, thus signifying the unified GM Europe.
Power first came from 1.0 L 45 hp, 1.2 L 55 hp, 1.3 L 70 hp and 1.4 L 75 hp petrol engines. (The first engines were all equipped with carburetors; fuel injection came later, but never for the 1.0.) The engines were based on the well proven Family II design, except for the 1.0 L and early 1.2 L engines, which were based on the OHV unit from the Kadett C.
Opel had been transformed and rebuilt before. Beyond the efforts of the company's staff, very little was functioning in the factories and plants. Many of the tools with which they once had worked were gone. The Brandenburg truck plant fell into the Russian zone of a divided postwar Germany. It did not stay there long. All the machinery and equipment – right down to the window frames and bathroom fixtures – were dismantled and shipped to a site near the Ural mountains.
The manufacturer now offered two versions of the Kadett, designated the "Kadett KJ38 and the "Kadett K38" the latter also being sold as the "Kadett Spezial". Mechanically and in terms of published performance there was little to differentiate the two, but the "Spezial" had a chrome stripe below the window line, and extra external body trim in other areas such as on the front grill. The interior of the "Spezial" was also better equipped. To the extent that the 300 Mark saving for buyers of the car reflected reduced production costs, the major difference was that the more basic "KJ38" lost the synchromous springing with which the car had been launched, and which continued to be fitted on the "Spezial". The base car instead reverted to traditional rigid axle based suspension similar to that fitted on the old Opel P4.