Cosmin Olaroiu's men have now won all seven of their opening league clashes, and enjoy a six-point lead at the top of the division as a result.
Resuming their league campaign after almost a month's break, Al Ahli picked up where they had left off, taking a lead through Brazilian Grafite in the 31st minute before defending resolutely to maintain their advantage.
Further strikes in between from Adeilson and Carlos Villanueva for the visitors sealed their emphatic triumph, while Kamel Chafni's 41st-minute strike for Al Dhafra proved scant consolation.
Bani Yas and Al Wasl also enjoyed impressive away wins, the former beating Emirates 3-2, while new Al Wasl boss Hector Cuper kicked off his tenure with a 3-1 victory over Dubai.
Sunday's fixture between Al Shaab and Ajman also offered plenty of entertainment, and after the visitors enjoyed a 1-0 lead heading into the break given to them through Boris Kabi, the second half brought seven goals, and an amazing late flurry, as it ended 4-4.
Elsewhere, there was a 4-3 triumph for Al Jazira over Al Wahda thanks to an injury-time effort from Nelson Valdez, while Al Sharjah's visit to Al Nasr ended goalless.
