its normal vith a minimal leak
..have not seen a total dry 550.
. but the problem are o ring and puch#s( rubber disces )vho closes cast /holes /pin bolts holes.. left from produktion,, and oil main gallery goes to the top of engine sealed by small o rings. passing cylender block./ head.vho not can do the job 100%
its not head gasket who leaks..but the o rings not seal prober