If you have updated with latest firmware you should be able to set an audio delay on the Oppo 103 with values up to 200ms. This should hopefully help with lip sync issues. I by chance just recently asked this question of Oppo for same reason and am considering 103 or 105. Would be good to know if this fixes issue ?
Trouble with audio video sync
I hooked up a oppo 103 to my rotel 1068 preamp processor using the analog cables, since the rotel does not have hdmi,my problem is that on some blu ray music videos and some movies the music or sound comes slightly ahead.so far have reset oppo to factory settings, made sure the video is off on my rotel,but still have the problem, so I hope somebody out there has a solution. Would gladly try anything.