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.
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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.
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The Ascona took its name from the lakeside resort of that name in Ticino, Switzerland, and already in the 1950s a special edition of the Opel Rekord P1 was sold as an Opel Ascona in Switzerland, where the name was again used in 1968 for a locally adapted version of the Opel Kadett B into which the manufacturers had persuaded a 1.7-litre engine borrowed from the larger Rekord model of the time.