Neymar took no time to adjust in his return from injury, while Luis Suarez was a bit rusty in debut as the Spanish giant drubbed the Mexican champion.
Suarez replaced Rafinha Alcantara with 13 minutes remaining to a rousing reception at Camp Nou, but understandably looked a little rusty on his first appearance since the World Cup.
The Uruguay international arrived from Liverpool for a reported fee of 75 million pounds last month under something of a cloud, having been banned from all footballing activity for four months because of his bite on Giorgio Chiellini in Brazil.
However, the Court of Arbitration for Sport last week cleared him to train and play in non-competitive matches - something coach Luis Enrique took full advantage of in fielding Suarez as a late substitute in an easy Trofeo Joan Gamper win.
The new Barca boss - himself afforded a generous welcome from the Camp Nou faithful before kickoff - could also welcome Lionel Messi and Neymar back after their exertions at the World Cup.
And Luis Enrique's side got off to an ideal start when Messi and Neymar both found the target in the opening 12 minutes, before the superstar pair linked up again shortly before the break - allowing the Brazil international, showing few ill-effects of the back injury that cut his World Cup short, to score his second with a nonchalant backheel.
Munir El Haddadi tucked home a fourth early in the second half before Suarez - who will not play in Barca colors again until late October, with his competitive debut potentially coming against Real Madrid - was brought on.
Youngsters Munir and Sandro then wrapped up a comfortable Barca victory in the team's final match before beginning its La Liga campaign against Elche on Sunday.
While the cheers were the loudest for Suarez and Enrique, Leon's Rafa Marquez, playing his final game at the club, also was given a large ovation as he left the Camp Nou pitch where he once starred for Barcelona.