The Carol was perhaps overengineered: it had a very strong monocoque body, a four-cylinder four-stroke engine with a five-bearing crankshaft and four-wheel independent suspension by torsion bars, but this led to high production costs, comparably high weight, and its very comfortable ride was offset by cramped accommodation. Nonetheless, the Carol was an incredible success in the marketplace, capturing 67% of the Kei market in its first year. A better equipped DeLuxe version was added in May 1962, along with a changed angle of the rear window to help it stay clean. In September 1963, shortly after a reshaped combustion head and upgrade to , a four-door version appeared.