In October 1948 the Kapitän was re-introduced as a large six-cylinder saloon only, based on the 1939 version. The main differences were round headlights as opposed to hexagonal ones. From May 1950 the shifter was relocated from the floor to the steering column. The first post-war Kapitän reached a top speed of 126 km/h (78.3 mph), needed 29 seconds to reach 100 km/h and consumed 13 l/100 km (18 mpg (US)) in the process.
The 1958 Kapitän (series P1), introduced in June 1958, was both wider and lower than its predecessor, and featured panoramic windows. It was only built for one year. This time, the 2.5 ltr six's output was raised to 80 PS (79 hp). Wheelbase, track widths, length and width were all slightly stretched, while a flatter roof made the car some 6 cm/2.4 in lower.
The P2 Kapitän came to market in August 1958 and while it still had the panoramic windscreen, it gained a new grille and a redone body with a more angular roof and a new rear. It was driven by a stronger new, oversquare 2.6 liter-inline six, still of OHV and pushrod design. Carried over were the 3-speed and 4-speed overdrive transmission; the latter was replaced from December 1960 by a version of GM´s 3-speed Turbo-Hydramatic automatic. The P2 climbed to a top speed of 150 km/h (93.2 mph), reached 100 km/h in 16 seconds and consumed 12 l/100 km (19 mpg (US)). From August 1959 to December 1963, Opel built 145.618 units of this Kapitän series.Source: Wikipedia.