Cadillac Series 90s for Sale From 1930 to 1940, General Motors produced a big luxury car with a huge engine. Consumers demanded a powerful engine and a smooth ride and manufacturers responded with multi-cylinder cars. The Cadillac Series 90 held GM’s largest such engine, the V16. With this engine, the car was Cadillac’s priciest and fanciest to date. The coming of the war in Europe caused a sales slump and the end of the Cadillac Series 90 in 1940. If you are looking to add one of these to your collection, start your search on FossilCars.