 In 1979 the twentieth year of Leopard production, the tyre equipment and coolant warning system were revised, the wide ratio Pneumocyclic with direct air operation again became standard and the ZF S6-80 six-speed synchromesh became a general sale option on coach chassis designated by .5 these were the PSU4F, PSU3F and PSU5D

In 1982 with the TL11-powered Tiger already launched, the PSU4G, 3G and 5E had a rationalised O.680 which shared TL11 components.In England, sizeable Leopard fleets were built up by various National Bus Company subsidiaries including 
Birmingham & Midland Omnibus Company.BET Group subsidiaries were major customers for Leopards.