Oil Question

If I remember it was .0015. I’ve run the 20-50 from the first start. I haven’t had any issues and when going to the partial synthetic noticed the slightly less oil pressure. I do think you are correct as it seems to keep a more constant pressure once warmed up and at a stop light/sign. What changes would I see if I went to full synthetic and should I be using any ZDDP additive with synthetics ?
Thanks Rod