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This model was introduced to the public for the first time in 1978. Two bodywork versions were on offer - sedan and estate. Diesel versions TD and GTD were equipped by 4-speed gearbox, GTD on demand also by 5-speed gearbox. The first versions TL, GTL had a 1397 ccm engine of 64 Hp output, versions TS, GTS were equipped by 1647 ccm engine that gave a 79 Hp output. Renault 18 equipped by an automatic gearbox had an engine of the same capacity, but reduced output of 73 Hp. The performance of 1647 ccm engine was increased to 96 Hp in 1982.
      Production of a new R18 turbo model equipped by an engine of 110 Hp output started in 1981. New turbo engine that gave 125 Hp output appeared two years later.
Four wheels drive R18 version showed up in 1984. A new 1995 ccm engine of a 104 Hp output was born the same year.
    The production of R18 finished in 1984 for French’s manufacture. In several countries like Argentina, Mexico, Maroco, Indonesia etc, this model still produced until 1989.

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Technical parameters:

taken from http://www.renaultclub.cz

Renault 18 (1978-1986)
1978
Presentation in April 1978. Four models in the range, among which two can be equipped with an automatic gearbox. 154.917 units sold, the beginning of a commercial success.

1979
Some rare equipment changes. 366.811 units made.The 18 break is sold for March 1979. Three models available (TL-TS-TSauto)

1980
New range, with the "L" version and its poor equipment. New automatic version. 352.336 R18 made that year

1981
Two new models: the Diesels and the Turbo. 342.829 Renault 18 made.

1982
The end for the TS and Break automatic. New GTL, GTS ans GTD Breaks. The GTL (Sedan and Break) get the 1,6 litre engine, with only 73 hp and five-speed gearbox. 289.492 R18 made.

1983
New, more powerful automatic version. Diesel and Turbo automatic versions available. New Break Turbo, with a new, more powerful engine: 125 hp DIN. New 4WD breaks. The "American" model with specific paint and equipment released in March 1983. Only 236.138 R18 made.

1984
Autumn 1983: the GTX, with the two liter of the R25, released. It replaces the 18 GTS. New 18 Turbo Diesel. "Type 2", with stylistic gimmicks taken from the 25 (front grille, spoilers). 167.056 R18 made in 1984.

1985
No noticeable change, but the 18 GTD automatic disappears. 92.347 R18 get out from factories.

1986
Summer 1985: all models are called "Gala". No more Turbo. 33.055 18 made in the world in 1986, among them 20.038 in France.

1987 to 1994
The 18 sales stopped in 1986 in France and Europe, but the production went on for export purposes. Argentina and Uruguay were the only places were it was made hereafter, until 1994. Some 130.000 Renault 18 would have been made, according to statistics.
French production:
1987: 3.114 units
1988: 2.938
1989: 948

Some 2.029.000 R18 made in total.

* all datas taken from http://ptikem.free.fr/evolutiongb.htm