Theoretically following the nomenclature from earlier models 7 is the series, 4 is the number of cylinders and 5 the number of doors so a saloon would be a 744 (though of course both 740 and 760 could be had with the 6 cylinder diesel and they were never badged as anything other than 740 regardless of number of doors :P the system was used fairly strictly in the 100 and early 200 series but by 700 and the later 200s they'd stopped using it so strictly. Presumably it made the range a bit easier to understand.
Richard
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