Jockey Luke Nolen took it fairly easy with the world's best sprinter, keeping the brakes on until the 400m mark.
Queenslander Buffering led the 1200m sprint early but it was obvious that he was there on sufferance.
Nolen then gave Black Caviar a squeeze at the 300m and she moved past Buffering effortlessly and strolled away from him in the run to the line.
The five-year-old mare, dubbed by some as simply unbeatable, increased her record-breaking run in her first attempt at a Group One race this campaign.
The Peter Moody-trained wonder mare surpassed turf legends Carbine and Bernborough on consecutive wins with her victory.
Buffering held on well for second with Black Caviar's stablemate Mid Summer Music third.
"They expect her to win," Nolen said.
"You don't want to let anyone down.
"I'm just over the moon.
"She's done a fantastic job.
"She's a great ambassador for Australian racing."
Moody said he was relieved the mighty mare had been successful again.
"I'm just grateful to be a little part of it," he said.
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- With AAP