There were also special models which were not solely a marketing exercise, such as the Renault 4 Sinpar 4x4, the Plein Air, a pickup truck, LPG versions and electric versions. In 1978, the R4 GTL arrived. It had the 1108 cc engine from the Renault 6 TL, albeit with the performance reduced for better economy, and bigger drum brakes. The GTL was identifiable by its grey front grille, grey bumpers, and grey rubber strips along the bottoms of the doors. It also had an extra air intake below the front grille (as a result, the registration plate was moved down to the bumper), and 12 inch (304.8 mm) wiper blades instead of the original 10 inch (254 mm) ones. A year later, the GTL got front disc brakes (the handbrake now working on the rear wheels) then anothet year later (1980) the handbrake leve