In September 1967 a fast back "Limousine" model, designated as the "Kadett LS" and offered with two or four doors, joined the range.

The newer Coupé, with an increased quantity of glass, was slightly heavier than the "gills-coupé" as well as being less aerodynamically efficient, leading to a small reduction in claimed top speed.

At launch, and for the next two years till September 1967, all Kadett Bs were fitted with an OHV four-cylinder "over-square" water-cooled engine.

In September 1967, as part of a larger proliferation of engine and trim options, a more powerful version of the 1,078 cc engine became available, listed as the "1100 SR" motor, fitted with two Solex 35 PDSI carburetors and providing a maximum output of 60 PS (44 kW; 59 hp) at 5,200 rpm.

[7] However, the early 1970s saw increasing awareness of the dangers to health arising from lead being added to road fuel, and the oil companies responded to the resulting political and regulatory pressures by reducing both the levels of lead in fuel and the availability at filling stations of higher octane petrol/gasoline.

High-compression versions of the Opel 1,078 cc engine were therefore withdrawn from August 1971, leaving just a 50 PS (37 kW; 49 hp) unit which used the 7.8:1 compression ratio that had been used in the base version back in 1965, delivering a reduced torque (presumably as art of a tradeoff against higher power output).

In the Kadett B the engine provided a maximum output of 75 PS (55 kW; 74 hp) employing a relatively high 9.5:1 compression ratio.

Again, only the high-compression version of the engine was listed for the Kadett, providing maximum output of 90 PS (66 kW; 89 hp) at 5,100 rpm, using a 9.5:1 compression ratio.

After August 1971 the compression ratio was reduced to 9.0:1 due to the reduction in octane levels available at filling stations.

The 106 PS (78 kW; 105 hp) powered Kadett B Rallye Sprint was less of a rarity in Sweden where a high proportion of the cars produced were sold.

The car came with a four-speed all-synchromesh manual transmission as standard, gear selection being performed using a centrally positioned floor-mounted lever.

From November 1968 on the larger-engined cars, and from February 1969 also on the smaller-engined Kadetts, it became possible to specify the alternative of a "GM Strasbourg" Turbo-Hydramatic 180 three-speed automatic transmission, available at the extra cost (initially) of 800 Marks.

Two years after launch, however, in August 1967, the simple longitudinally mounted leaf springs with a centrally connected rigid axle which till then had suspended the rear wheels were replaced with a more sophisticated setup incorporating coil springs, trailing arms and a Panhard rod.

By building large batches of identically equipped cars the manufacturer was able to provide attractively low prices to customers prepared to forego the chance to specify their Kadett "à la carte" from the colour, trim and options lists.

Also the recommended price was 1,171 Marks (12%) lower than for the similarly powered 1.2-litre 60 PS (44 kW; 59 hp) Kadett Rallye.

Appropriate features included in the "customer-friendly" price were a sports exhaust/muffler, the rallye gauge cluster from the Rallye model, a sports steering wheel, servo assisted brakes with discs at the front, antiroll bars, high-backed front seats, sports wheels and tires, a heated rear window, seat belts and, under the bonnet, an enhanced alternator to cope with the anticipated demands of additional electrical equipment.

The special edition Kadett Holiday came with a standard package of extras, chief among which were a steel sliding sun roof, sports wheels, large fog lights at the front and a rear fog light, and high-backed front seats incorporating stylish wrap-around head restraints.

The cars were powered by the 60 PS (44 kW; 59 hp) 1.2S engine, and for approximately an extra 500 Marks the 3-speed automatic "Strasbourg" transmission could be specified.

The Kadett-Festival buyer could choose from three fashionably metallic body colours: "sahara gold", "monza blue" and "lime green".

"Extras" included as standard features in the "friendly" price were velour covered seats exclusive to the Kadett Festival, a sports steering wheel, front disc brakes packaged with servo-assistance for the brakes, antiroll bars front and rear, a more powerful alternator than on most Kadetts, halogen spot lamps, a heated back window, sports wheels with radial tires and the external decoration of thin twin side-stripes.

For most of the run-out specials, customers were restricted to a choice of three body colours, but Grand Prix buyers could choose from between roof-tile red, yellow ochre, sierra beige and arctic white.

The "Opel Ascona" name was originally used for a 4-door "Limousine" (saloon)-bodied edition of the Kadett B powered by the manufacturer's 1,698 cc CIH high compression ratio "1.7S" engine.

Opel's first four Asconas came from the Kadett plant in Bochum, but all the rest of the 2,560 Kadett-based cars were assembled at Biel, near the Franco-German language frontier through central Switzerland, using imported components.

The 1968 had side marker reflectors on the front fender and larger wrap-around tail lights that were unique to the US Market to meet new US regulations.

In the case of the four door it was only offered in the 1967 (all 1.1 L with trim matching the European Opel Kadett of the time) and 1971 model years (all 1.9 L and less than 700 were imported and sold).

The two-seat Opel GT was heavily based on Kadett B components, its body made by a French contractor, Brissonneau & Lotz, at their Creil factory.