Osella has been active as a producer of racing vehicles for sports car racing since the early 1970s. The first of these prototypes was the PA3, which appeared in 1974. The PA8 was the sixth model in the order of types, succeeding the PA7. What all PA prototypes of the 1980s had in common was that they were largely based on the PA3 and were only development stages of this racing car. Like the PA7, the PA8 was developed for the 2-liter racing formula. The racing vehicles were entered either in the Italian Group 6 Championship or the class for sports cars with a displacement of up to two liters in the World Sports Car Championship. From the mid-1980s, this car model was also used in the French Group 6 championship and the Interserie. The engines came almost exclusively from BMW, either the M12 2-liter engine from Formula 2 or, later in Interserie, the M12/13 1.5-liter turbo units, which had their origin in Formula 1.