NSU Ro 80 Wankel
The 1975-77 Ro 80 represented the mature version of NSU's groundbreaking design, with improved engine seals addressing earlier reliability concerns. The aerodynamic wedge shape achieved a remarkable 0.35 drag coefficient, while the smooth Wankel rotary engine delivered turbine-like power delivery. Advanced features included a clutchless semi-automatic transmission, four-wheel disc brakes, and inboard front brakes for reduced unsprung weight. Despite winning 1968 Car of the Year and influencing designers worldwide, warranty costs from early engine failures bankrupted NSU, leading to absorption by Volkswagen. Late-production Ro 80s like these are the most reliable and represent what might have been.
Later 1975-77 models have most reliable engines with improved seals. Verify engine compression across all chambers - should be even. Check for oil consumption and blue smoke indicating seal wear. Original engines are increasingly rare; many have piston engine conversions. Verify transmission shifts smoothly - clutch packs wear. Body rust is common especially in sills and front suspension towers. Original interior trim pieces are difficult to source. Join specialist clubs for parts support.
1975-77 models featured improved apex seal materials addressing earlier failures. Production ended in 1977 as Audi absorbed NSU completely. The Neckarsulm factory continued as Audi's high-performance manufacturing center. Claus Luthe's aerodynamic design influenced Audi 100 and future generations of executive sedans.