Oxlade-Chamberlain spent six years with Arsenal, where he was never a guaranteed starter and the first few months of the England international's time at Anfield proved a struggle, as well.
"It was a great start for us - going 3-0 up before half-time set us up brilliantly", the England worldwide told BT Sport.
"It was an wonderful atmosphere, the best I've ever played in", the 24-year-old said.
"Hendo [Jordan Henderson] was warning me about that before, he said "wait until you see it tonight" and I kind of knew what he meant but until you're out there and you see what the fans are doing and how much passion there was, it's was incredible to be part of".
"I think it's the same for Theo really, he needed to get away".
"City are an incredible football team but they are only human and you put anyone in a pressure environment in an atmosphere like that maybe it can disturb them".
Oxlade-Chamberlain ranked his long-range strike past Ederson among the finest goals of his career but surprisingly, given his contribution in central midfield, admitted he was dissatisfied with his overall performance. "It got us going and it would probably shake anyone up so you have to give fans credit for that".
"Slowly it is starting to pay off". It definitely shows why I wanted to come here. My game I wasn't too happy with.
"It was one of those nights where had I not scored I would have been disappointed in myself". "I've been working on that, on trying to do it more often. But I was really happy for the team and tried to work as hard as I can to help the boys to defend".
Oxlade-Chamberlain has been around for so long - he is now in his 10th season as a professional - that it is easy to forget he is still very young but it is clear he is exhausted of being talked about in terms of potential and, like the side he represents, is in a hurry to make a lasting impression.
"We definitely have qualities that are suited to this competition", he said. A pattern emerged of one good game followed by three or four hugely frustrating ones, with the Ox one of several Arsenal players particularly guilty of losing possession in indefensible areas. [Oxlade-Chamberlain] loved Arsene Wenger, but sometimes it is just about changing the environment.