The win helped Arouba keep its hold on the lead after five rounds with 11 points. Musannah is a point behind after beating Sur 1-0 in another match.
Al Suwaiq drew 2-2 with Sohar for both the sides to have nine points each, with the former ahead on goal-difference.
The match between the two Batinah-based teams broke the OPL attendance record with 14,000 fans having turned up at the Sohar Sports Complex, according to official figures.
Other results: Friday: Al Khabourah 1 Al Nasr 1; Thursday: Shabab 2 Muscat 2, Salalah 0 Saham 0, Al Nahda 1 Fanja 1.
Salaam, Dibba and Bidiyah advance
Al Salaam thrashed Khasab 4-0, while Dibba edged past Al Wusta 1-0 and Bidiyah won 5-4 in a penalty shootout against Al Ettifaq to advance to the round of 32 in the His Majesty's Cup football championship qualifiers played on Friday.
The three teams will join the OPL and the first division teams for the round of 32 beginning next month.
The round of 32 will take place on November 1-3, while the round of 16 is scheduled for January 14-15, 2016.