If you run an oil past the point at which the active detergents run out, but are still getting good wear metal figures then all is well, BUT I would suggest that you start using a major brand oil flush additive designed for use at idle just before the oil & filter are changed. Otherwise the lack of active detergents will result in long term sludge and varnish deposits.
Any oil flush additives can cause an increase in any oil leaks, due to the false oil seal effect where sludge or varnish can help a worn or split oil seal or gasket to function.