Launched as early as 1936 to replace the 380 K and 500 K, the 540 K, which was to be available in several versions before the hostilities of the Second World War broke out, reflected the most advanced technology of the time. The 8-cylinder in-line 5.4-litre engine produced 115 bhp at 3400 rpm without the compressor and increased to 180 bhp when the compressor was used,it was then capable of doing 110 mph.