The (p, V, T) behaviour of (octane + I-chlorobutane) was measured at the temperatures (298.15, 308.15, 318.15, and 328.15)K and over the pressure range (0.1 to 40 MPa) with an accuracy in density of +/-1 (.) 10(-4) g (.) cm(-3). An apparatus for (p, V-m, T) measurements of liquids and liquid mixtures whose main part is a high-pressure vibrating-tube densimeter working in a static mode was used for the measurements. Excess molar volumes were calculated from the data and fitted to the Redlich-Kister equation. (C) 2003 Elsevier Science Ltd. All rights reserved.