Loeb and new co-driver Isabelle Galmiche dominated the trio of asphalt stages, held in tricky icy conditions, as the nine-time world champion quickly gelled with the new M-Sport Ford Puma.
A series of strong times helped the pair climb to the lead after Ogier and Benjamin Veillas dropped 15.8s on the stage 5, after opting for a curious approach on the ice, allowing Evans to also leap into second overall.
As a result, Loeb now leads the rally by 10.6s from Evans, while Ogier is 13s adrift in third.
Hyundai's Thierry Neuville ended the loop in fourth after M-Sport's Adrien Fourmaux suffered a frightening roll on Stage 3 that put him out of the rally.
M-Sport's Craig Breen has climbed to fifth ahead of Ott Tanak and Gus Greensmith.
Growing in confidence behind the wheel of the Puma, Loeb clocked his 922nd WRC stage win of his career and the first for M-Sport's new creation in Stage 3.
Although surprised by icy patches and the downhill speeds produced by the new cars, he managed pip then rally leader Ogier by 1.2s.
Ogier was lucky not to lose more time after grazing a barrier with the left rear of his GR Yaris towards the end of the stage.
Toyota teammate Evans also found the grip difficult to judge and escaped from a wild slide on the ice to end the stage third fastest.
Breen was fourth quickest but admitted he was not yet in a position to fully use the potential of his Puma.
He fared much better than teammate Fourmaux, who was lucky to avoid injury after spectacular crash that resulted in a series of rolls down a steep mountainside.
Stablemate Greensmith took over fourth overall as a result of the incident but his progress was slightly hampered by running wide at a 90-degree left.
Despite an error with the hybrid system, Tanak was the fastest Hyundai in fifth, 7.5s adrift but ahead of teammate Neuville, who was not happy with life in the new i20 N after a spin early in the test.
Loeb continued to cut into Ogier's rally lead by winning the following test, this time by a slim 0.8s from Tanak, who was now aided by a functioning hybrid system.
Although little had changed with his car, a frightened Neuville was third fastest, a tenth further back, but ahead of the Toyota pair of Evans and Ogier. The latter dropped 2.7s in the stage after electing to err on the side of caution.
Breen was sixth ahead Greensmith while Takamoto Katsuta and Kalle Rovanpera continued to struggle for speed from their Toyotas.
Oliver Solberg's day began with smoke coming into his cockpit on the first test, this continued on the next test, with the Swede admitting that he was crying and the fumes were causing him to lose concentration. He made it to the end of the rally.
Loeb completed a hat-trick of stages wins on the morning's final blast, clocking a time 2.3s faster than Evans, who turned heads with his early pace.
Evans was 13.5s faster than Ogier as the Welshman produced his best showing yet in the new GR Yaris despite suffering a slow puncture.
In contrast, Ogier was particularly cautious over patches of ice that cost him valuable time and the rally lead.
Neuville completed the stage third fastest ahead of Tanak, Katsuta and Breen, with Ogier seventh of the runners.
Unfortunately for Greensmith, a hybrid issue with his Puma resulted in the Brit slipping from fourth to seventh overall.
The Monte Carlo Rally continues this afternoon with a repeat of the morning loop of stages, beginning at 1316 GMT.
