[6] Later that year, Olivier made his first appearance at the 24 Hours of Le Mans, sharing his Porsche as a private entrant with co-driver Eugène Martin.
[8][9][10] In October, he served as co-driver to Gilberte Thirion, and the pair won the Tour de Belgique road rally.
[22] 1955 began with a return to the Rallye des Routes du Nord, this time sharing a Gordini 1490 with Jacques Ickx; however, the pair retired with an accident.
The circuit was notoriously demanding on a car, but the pair praised each other's calm and measured approach to such a long and challenging race.
He shared one with German driver Josef Jeser, placing second in the S1.1 class, and entered another in partnership with Ecurie Belge, which Wolfgang Seidel and Olivier Gendebien drove to second in S1.5, splitting Porsche KG's works entries.
In 1956, he entered Le Mans with Veuillet in his privateer Porsche 550, but the car ended up being driven by Claude Storez and Helmut Polensky.
[30] His only race that year was the 1000 km de Paris at Montlhéry, sharing a Porsche 550 with Robert Dutoit but retiring with an accident.