The band will be releasing their first album in eight years, "Hardwired... To Self-Destruct" in November.
Singer James Hetfield said it takes time to create anything good and the members also had creative differences which delayed the album, reported Female First.
"Anything worthwhile takes work. You know, a marriage is tough enough but being married to three other guys in a band for 30-odd years?
"We're guys and we all have our own agenda - and we can be cynical about each other's agendas. We're creative, too, so we make up tons of stuff in our heads if we don't communicate. So communication is pretty huge. We love each other and we hate each other and sometimes it's really easy, sometimes it's really hard but it's always worth it," Hetfield said.
"It doesn't feel like we're in the twilight of our career. From what I can gather, collectively, we still have a lot to say, music that we want to create and everything that comes in the wake of that. If I was just to stop now it would feel like coitus interrupts or something. I'm not finished yet!" guitarist Kirk Hammett said.