<page_title> BMW 6 Series (E24) </page_title> <section_title> Engines </section_title> <table> <cell> 635CSi <col_header> Model </col_header> </cell> <cell> 1978-1982 <col_header> Year(s) </col_header> </cell> </table>
In 1978, the 635CSi variant was introduced.