The O − C diagram of GW Car is presented in Fig. 1. The long-term varia-
tions in the displacement of the secondary minima with respect to the primary
ones, which can indicate an apsidal motion, are clearly visible in the old pho-
tographic data. Heged¨s (1988) included eclipsing binary GW Car into a list ofu
binaries with poorly proved or questionable apsidal motion. Our new photoelec-
tric data are not sufficient to prove quoted orbital eccentricity e = 0.025 and
discuss possible existence of an apsidal motion in the system. The O − C dia-
gram evidently indicates the long-term orbital period decrease as a consequence
of the mass transfer/loss and/or the light-time effect due to the presence of a
third body. More data are necessary to distinguish the cases.