Erling Haaland scored his 2nd consecutive hat-trick to help City win, while Arsenal and Liverpool struggled to get 3 points.
Also in this round, Chelsea and Tottenham did not achieve the desired results against their underrated opponents.
Chelsea lost 1-2 on the away trip to Southampton while Tottenham let West Ham hold a 1-1 draw.
Manchester City continued to play well to win 6-0 against rookie Nottingham Forest in the 5th round of the Premier League.
Erling Haaland shone with a hat-trick, Julian Alvarez contributed a brace while the other went to Joao Cancelo.
Notably, this was the second game in a row the Norwegian striker scored a hat-trick, after he did the same to help City beat Crystal Palace in the previous round.