The Monasix was Renault's first mid-range vehicle to be powered by a six-cylinder engine. It was also the most spacious saloon in its category, but that didn't mean it was expensive to run.

On the contrary: it was particularly economical, with very moderate fuel consumption, oil consumption three times lower than other vehicles, and low maintenance costs. Safety features, as from 1928, included mechanical power brakes, previously found only on much more expensive models.

The Monasix was also a very rugged car, which made it eminently suitable for use as a taxi: 5,000 Monasix taxis would cover 188 million kilometres over a period of just two years.

Rugged design was perfectly compatible with sporting temperament, as proved by racing honours such as first two places in the 1928 Morocco Rally at an average speed of 91kph, which is quite remarkable when we consider the condition of Moroccan roads and tracks at the time. The Monasix was available in five versions, ranging from a four-seater faux cabriolet with covered cockpit through to the Torpédo. True to its reputation as a pioneer in passenger comfort, the Monasix introduced an adjustable-length rear bench in 1931.