As before with the XK range, standard (steel wheel) and special equipment models were available, but a bewildering range of models was to evolve. First, in 1958 the S model was announced, equipped to special equipment specification, and with a more powerful engine, though still of 3.4 liter capacity. Late in 1959 further options became available with the introduction of the 3.8 liter engine, and the XK150 was available not only in 3.4 liter versions, but two versions (normal and "S") of the 3.8. All three body versions were available with all the engine options. Production all but stopped after 1960, but very few cars appear to have been manufactured in 1961.