Automobile Club de l'Ouest
In lieu of getting the entrants to drain their cars at scrutineering, the Automobile Club de l'Ouest (ACO) decreed that 15kg would cover the weight of fluids on cars over 3-litres and 10kg for those under. The required ‘passenger-ballast’ rule of 60kg per extra seat, after the driver's, was maintained and additional to those minimum weights.