The first 7-series, coded E23, appeared in 1977. Over the next nine years the 6-cylinder engines were increased in capacity from 2.8-litres to 3.5-litres. In 1979 there was a turbocharged big six for the 745i. This book of articles includes road and comparison tests, model introductions, driving impressions, buying secondhand and specification data. Models covered are: 733i, 728, Hardy & Beck 733i, 735i, 732i, 745i, 735i, 735i Auto., 733i Auto., 735iA, Alpina B10, 735i L7.