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We present XMM-Newton observations of the eclipsing, disc accreting,cataclysmic variable OY Car which were obtained as part of the performanceverification phase of the mission. The star was observed 4 days after anoutburst and then again 5 weeks later when it was in a quiescent state. Thereis a quasi-stable modulation of the X-rays at ~2240 sec, which is mostprominent at the lowest energies. We speculate that this may be related to thespin period of the white dwarf. The duration of the eclipse ingress and egressin X-rays is 20--30 sec. This indicates that the bulk of the X-ray emissionoriginates from the boundary layer which has a negligible height above thesurface of the white dwarf. The eclipse profile implies a white dwarf of massM_{1}=0.9-1.1Msun and a secondary star of M_{2}=0.08-0.11Msun.Comment: Accepted by A&A for publication in the Special Issue on 1st science  with XMM-Newton, 6 page

First XMM-Newton observations of a cataclysmic variable I: Timing studies of OY Car