RepairPal Certified shops can diagnose and repair your 2003 INFINITI M45. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
First thing to do is visually inspect the threads on both the pan and the drain plug. Also , be sure they used a new washer ( correct type) at last service, they may have used the sealant because they lacked the correct washer.