Prototype W18 engines were produced for concept cars predecessors to the Bugatti Veyron in the late 1990s.
A later example is the 1929 Hispano-Suiza 18R, an aircraft racing engine produced in limited quantities in France.
[1] This was followed in 1934 by the Isotta Fraschini Asso 750, which was built in Italy and used in several flying boats.
[citation needed] The W18 layout has been considered for use in motor vehicles by two manufacturers, although neither reached production.
The W18 layout has been used on the high seas; CRM Motori SpA marine engines.