Lewandowski, Serge Gnabry and Leroy Sane scored for Bayern at the Allianz Arena whilst Benfica's Morato and Darwin Nunez netted for the visitors.
Lewandowski, who additionally had a penalty stored, has now chalked up 81 Champions League desires and a hundred appearances considering that his competition debut for ex-club Dortmund a decade in the past.
Bayern's fourth immediately win in Europe guarantees them a remaining sixteen area with institution video games left as they hold a six-factor lead at the top of Group E.
This was Julian Nagelsmann's first sport returned on the Bayern bench as the top educate overlooked the previous 4 video games after testing wonderful for Covid-19.
Bayern had an early scare when Manuel Neuer was beaten by way of a Lucas Verissimo header, but replays showed Benfica captain Pizzi changed into offside.
Lewandowski headed Bayern into the lead after Kingsley Coman became his marker Alejandro Grimaldo, then floated a chip to the lower back put up on 26 minutes where the Poland striker changed into ready.
A 2d intention followed six mins later while Benjamin Pavard lifted his pass over the defence which Lewandowski performed to Gnabry, who backheeled past traveling goalkeeper Odysseas Vlachodimos.
Yet Bayern didn't have things all their own way.
Morato gave Benfica a lifeline before the destroy when he met Grimaldo's move on the a long way post.
