Leicester responded well, and the match turned into an entertaining, end-to-end contest for the first half hour, a pleasant change from most City matches, which typically involve their opponents putting 11 men behind the ball, merely hoping not to lose.
Two of Aguero's goals - a delicate chip and powerful strike from the edge of the box - would have been worth the admission fee alone.
The player's frustration is born out of Leicester's astronomical demands for a player they signed for a reported £350,000 from French second-division side Le Havre in 2014.
It is hard to determine which would be sweeter for City supporters.
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Bangladesh out for 110 in Sri Lanka Test
While Silva continued in a solid manner like he did during the first innings, the visitors lost wickets in a heap late in the day. Resuming Friday on 4-56, Bangladesh lost 5-3 in three overs to give Sri Lanka a big lead on a pitch offering turn and bounce.
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On Friday afternoon, during Pep Guardiola's press conference ahead of their game against Leicester City at the weekend, the Spaniard once again mentioned Neville and took a dig at the former Manchester United defender.
Leicester have lost their last nine league fixtures against sides that started the day top of the league, scoring three goals and conceding 20.
De Bruyne was the inspiration yet again, playing an intricate pass into the area and Aguero fired past Schmeichel, despite the goalkeeper getting a hand to it.
Riyad Mahrez has at last returned to training for Leicester City after his self-imposed exile from the Foxes squad and could feature on Saturday against Manchester City, according to Sky Sports. He replaces Diabate. Both sets of fans cheer!
Their only two league victories in nine attempts came at home to Huddersfield and Watford.
Aguero punished a awful clearance from Kasper Schmeichel with a sublime dinked finish to net his 12th treble for the hosts, before saving his best until last with a dipping drive that crashed in off the bar.