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We revisit the XMM-Newton observations of the dwarf nova OY Car taken in July2000 which occured shortly after an outburst. Ramsay et al (2001a) found aprominent energy dependent modulation at a period of 2240 sec: this modulationwas only seen for app. 1/3 of the observation duration. In our new analysis, weexamine this time interval in greater detail. In addition to the 2240 secperiod we find evidence for other periods, the most prominent being near 3500sec. Both these modulations are most likely due to changes in photoelectricabsorption over this period: this is supported by phase-resolved spectroscopy.This may indicate the presence of matter above the accretion disc or a presenceof a magnetic accretion curtain. In this case the 2240 sec period couldrepresent a spin period of the white dwarf and the 3500 sec period a beatperiod between the spin and orbital periods. We also model the B band and UVeclipse profiles and light curves using a new technique to map the spatialextent of the accretion disc. As a result we find that whilst the opticalemission is dominated by both the emission close to the accretion disc boundarylayer and the hot spot where the accretion stream hits the disc, the UVemission is mainly dominated by the inner disc/boundary layer only.Comment: 10 pages, 12 figures, accepted for publication in A&

XMM-Newton observations of OY Car III: OM light curve modelling, X-ray timing and spectral studies