Ogier's Volkswagen was quickest on both the loop's stages, stretching away from the Citroens in the process.
But the frustrated Loeb did not feel there was anything more to the deficit than an errant tyre choice on Citroen's part, as its hards proved less compliant than Ogier's softs amid unforeseen drizzle.
Ogier did not have a flawless run, completing the long Asochinga stage with a loss of pressure in a rear tyre and some bodywork damage, but his lead was not jeopardised.
Rally Argentina
Ogier leads from Citroens in Argentina
02/05/2013 AT 14:33
Mikko Hirvonen remains in contention. Although he has lost second place to Loeb, he is only 1.8s behind his team-mate.
Jari-Matti Latvala was very happy with his pace as he took second to team-mate Ogier on SS4, but ended the day peeved when a handbrake issue cost him time on SS5's hairpins, leaving him 41s off the lead.
Mads Ostberg dropped out of fifth place when his M-Sport Ford broke a steering arm on the loop's first stage.
But M-Sport still has a car in fifth as Evgeny Novikov moved past the third VW of Andreas Mikkelsen to take the place.
Myriad dramas for the top-class tailenders mean Dani Sordo is already back within 22s of the top 10 after rolling his Citroen in the morning.
Rally Argentina
Loeb wraps up Argentina victory
04/05/2013 AT 17:09
Rally Argentina
Ogier leads from Citroens in Argentina
02/05/2013 AT 14:33