Léon Demeester first started Sinpar in 1907. Sinpar was sold to Saviem, the heavy truck division of Renault in 1975. The 4door Plein Air was first introduced at the 1968 Paris Motor Show, the picture below shows the same car 45 years later after a full restoration. This car is still owned by the Demeester family, who kept it after it Parisian unveiling. Sinpar Plein Air windshield, cutting off the roof, removed the hatchback and the door openings were profoundly modifying the overall appearance of the car. Renault and Sinpar were attempting to ride the buggy craze of the era by marketing it as a fun, beach car. If there was a significant complaint about the Plein Air, it was the ease of access for rear passengers, so in the fall of 1968 they attempted a possible fix to this issue. Introducing the Sinpar fourdoor convertible prototype at the 1968 Salon de Paris. While it definitely was easier to enter and egress, the motoring public preferred the panoramic views of the original Torpedo so no further four-doors were constructed. However, the original car is still owned by the Demeester family, who originally founded Sinpar, and brought it back after World War II. In 2003 the family had a complete restoration done, and the one off, four-door Sinpar Renault 4 is by far the rarest example from the series. During the later 1960s and early 1970s, Sinpar’s business increasingly focused on four-wheel drive conversions for various Renault models, notably the Renault Goélette, a van primarily used by the French army, along with the Renault 4L, and the Renault 12. The 4 –door Plein air on the Sinpar Stand in Paris Plein Air 4-door and the Demeesters
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