Peugeot's flagship, the 504 made its public debut on 12 September 1968 at the Paris Salon. The press launch which had been scheduled for June 1968 was at the last minute deferred by three months, and production got off to a similarly delayed start because of the political and industrial disruption which exploded across the country in May 1968 .
The 504 was a sunroof-equipped four-door saloon, introduced with a carburated 1796 cc four-cylinder petrol engine 97 bhp (72 kW; 98 PS)with optional fuel injection and 82 bhp (61 kW; 83 PS) . A column-mounted four-speed manual transmission was standard, a 3-speed ZF 3HP22 automatic available as an upgrade.
The 504 was European Car of the Year in 1969, praised for its styling, quality, chassis, ride, visibility, strong engine and refinement.
The 504 Injection two-door coupé and two-door cabriolet were introduced at the Salon de Geneva in March 1969. The engine produced the same 97 bhp (72 kW; 98 PS) of output as in the fuel injected saloon, but the final drive ratio was slightly revised to give a slightly higher road speed of 20.6 mph (33.2 km/h) at 1,000 rpm.
The 504 received a new four-cylinder 1971 cc engine, rated at 93 bhp (carburated) and 116 bhp (fuel injected), and a four-cylinder 2112 cc diesel rated at 65 bhp (48 kW; 66 PS). The 1796 cc engine remained available.
In September 1970 an estate was added, featuring a higher rear roof and solid rear axle with four coil springs. It was joined by the 7-seat "Familiale", which had all its occupants facing forward in three rows of seats.
Specifications. Body : length/width/height/wheelbase – cm (in) : 436/170/136/255 (171.7/66.9/53.5/100.4); weight : 1235 kg (2726 lb).
Engine : 4 cylinders in-line 1971 cc (120 ci), front-mounted, 5-speed manual, rear-wheel drive. Maximum power : 120 bhp @ 5200 rpm. Top speed : 177 km/h (111 mph); 0-60 mph : 11.4 sec.